Garuda - Garba Rujukan Digital

Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih Irdhawati, Irdhawati; Titasia, Ni Kadak Nevi; Sahara, Emmy
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.417

In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 Âµg/L and CPE-B was 5-50 Âµg/L. Limit of detection and quantization using CPE-B were 0.337 Âµg/L and 0.349 Âµg/L, lower than CPE i.e., 0.470 Âµg/L and 0.471 Âµg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.

Analisis Logam Fe dengan Teknik Voltammetri Pelucutan Anodik Pulsa Diferensial dalam Tanaman Pakcoy dari Perkebunan Sayur Bedugul Bali Irdhawati Irdhawati; Rosanti Suryani Tince Mbatu; Emmy Sahara
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Syarif Hidayatullah State Islamic University

Pakcoy is one of the most popular vegetable. The use of synthetic fertilizers and pesticides contain heavy metals can contaminate pakcoy vegetable. This research aims to determine the validity of measurements and concentration of Fe in pakcoy using differential pulse anodic stripping voltammetry technique.The working, reference, and counter electrodes were platinum disk, Ag/AgCl, and Pt wire, respectively. The optimum measurement results of the standard solutions of Fe(III) obtained the optimum deposition time was 70 seconds, the optimum scan rate was 10 mV/s, and the optimum deposition potential at -0.47 V. A linear concentration of standard solution of Fe(III) observed at the range of 50 ppb~500 ppb, with correlation coefficient 0.9954. Limit of detection was 50.18 ppb. The repetition of 10 times measurements had a Horwitz ratio of less than 2. Percent recovery was 100.26% ± 0.27%. The average of Fe(III) concentration in the samples from 5 (five) locations of the pakcoy sampling contains 3.82±0.29 ppm, less than SNI treshold line of 5.0 ppm.

Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih Irdhawati Irdhawati; Ni Kadak Nevi Titasia; Emmy Sahara
Jurnal Riset Kimia Vol. 12 No. 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.417

In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 Âµg/L and CPE-B was 5-50 Âµg/L. Limit of detection and quantization using CPE-B were 0.337 Âµg/L and 0.349 Âµg/L, lower than CPE i.e., 0.470 Âµg/L and 0.471 Âµg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.

PEMBUATAN DAN KARAKTERISASI ARANG DARI BATANG TANAMAN GUMITIR (Tagetes erecta) PADA BERBAGAI SUHU DAN WAKTU PIROLISIS I Made Siaka; Ni Putu Diana Febriyanti; Emmy Sahara; I Made Sutha Negara
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 4 No 2 (2016)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.897 KB)

ABSTRAK: Telah dilakukan penelitian tentang pembuatan dan karakterisasi arang dari batang tanaman gumitir (Tagetes erecta) pada berbagai suhu dan waktu pirolisis. Penelitian ini dilakukan untuk memperoleh suhu dan waktu yang optimum dalam pembuatan arang serta mengetahui karakteristik arang yang dihasilkan pada suhu dan waktu optimumnya. Karakteristik arang mengacu pada SNI 06–3730-1995 dengan melakukan analisis terhadap kadar air, abu, volatile, dan karbon serta daya serapnya terhadap odine dan metilen biru. Suhu optimum pirolisis pembuatan arang adalah 300oC dengan karakteristik terbaik berupa rendemen, kadar air, volatile, abu, dan karbon berturut-turut sebesar 40,27 ±; 4,00 ± 0,00; 6,58 ± 0,07; 4,34 ± 1,22; dan 85,06%, serta daya serapnya terhadap iodin dan metilen biru sebesar 631,0935 ± 0,00 dan 131,34 ± 1,7 mg/g arang. Waktu pirolisis optimum adalah 90 menit dengan karakterisitik paling baik, yakni rendemen, kadar air, volatile, abu, dan karbon berturut-turut sebesar 42,30 ± 8,7; 2,00 ± 0,00; 2,87 ± 0,07; 9,68 ± 1,17; dan 85,44% serta daya serapnya terhadap iodin dan metilen biru sebesar 647,4642 ± 0,00 dan 136,20 ± 1,28 mg/g arang. Arang yang dihasilkan dari pirolisis pada suhu dan waktu optimum memiliki karakteristik yang sesuai dengan SNI 06-3730-1995 memiliki gugus fungsi O-H dan berupa karbon alifatik. ABSTRACT: This paper discusses the manufacture and characterization of carbon made from the stems of marigold (Tagetes erecta) at various temperatures and times of pyrolysis. This research aimed to obtain the optimum temperature and time of pyrolising in producing carbon, as well asto recognize the characteristics of the carbon produced. Characteristics of the carbon quality followed the Indonesian National Standard (SNI) 06-3730-1995 by analyzing the contents of water, volatile substances, ash, and carbon, as well as, the ability of the carbon in absorption capacities of iodine and methylene blue. The optimum pyrolysis temperature in producing carbon was 300oC with the best characteristics including result rendement, contents of water, volatile substances, ash, and carbon were 40,27 ± ; 4,00 ± 0,00; 6,58 ± 0,07; 4,34 ± 1,22, and 85,06%b/b respectively, as well as, the absorption capacities of iodine and methylene blue were 631,0935 ± 0,00 mg/g and 131,34 ± 1,7 mg/g respectively. The optimum time of pyrolysis in producing carbon was 90 minutes with the best characteristics including result rendement, contents of water, volatile substances, ash, and carbon were 42,30 ± 8,7; 2,00 ± 0,00; 2,87 ± 0,07; 9,68 ± 1,17; and 85,44% b/brespectively, as well as, the absorption capacities of iodine and methylene blue were 647,4642 ± 0,00and the 136,20 ± 1,28 mg/g respectively. The carbon produced from the optimum of pyrolysis temperature and time had characteristic in accordance with the SNI 06-3730-1995, it contained O-H functional group and it is in aliphatic structure.

ADSORPSI ZAT WARNA RHODAMIN-B DALAM LARUTAN OLEH ARANG AKTIF BATANG TANAMAN GUMITIR TERAKTIVASI ASAM FOSFAT Emmy Sahara; Putu Sri Gayatri; Putu Suarya
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 6 No 1 (2018): Volume 6, Nomor 1, 2018
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.881 KB)

ABSTRAK: Zat warna rhodamin B adalah salah satu zat warna yang terdapat dalam limbah yang berasal dari industri tekstil/pencelupan. Salah satu cara yang dapat dilakukan untuk menangani pencemaran lingkungan perairan oleh adanya zat warna ini adalah adsorpsi dengan arang aktif. Arang aktif yang terbuat dari batang gumitir dan diaktivasi dengan asam fosfat telah dilaporkan dapat menurunkan kadar Cu dan Pb dalam air limbah pencelupan. Penelitian ini bertujuan untuk menentukan kapasitas adsorpsi arang aktif yang dibuat dari batang gumitir teraktivasi asam fosfat (H3PO4) 15% terhadap zat warna rhodamin B. Optimasi kondisi penyerapan dilakukan dengan menentukan waktu setimbang, isotherm adsorpsi dan pengaruh pH dalam mengadsorpsi zat warna rhodamin B. Hasil penelitian menunjukkan bahwa kondisi adsorpsi yang optimum terjadi pada waktu kontak selama 90 menit (jumlah maksimum adsorbat yang teradsorpsi 2,3437 mg/g), pH 3 (jumlah maksimum yang diserap adsorben 2,2778 mg/g) dengan konsentrasi isotherm adsorpsi sebesar 120 mg/L. Kapasitas adsorpsi pada kondisi optimum ini adalah 2,6320 mg/g. Proses adsorpsi arang aktif dari batang gumitir dalam penelitian ini tergolong kemisorpsi dengan energi adsorpsi sebesar 27,7338 kJ/mol (mengapa negatif)dan mengikuti model isotherm adsorpsi tipe Langmuir dengan nilai koefisien linier (R2) 0,8906. Kata kunci: adsorben, arang aktif, kapasitas adsorpsi, rhodamin B ABTRACT: Rhodamine B colorant is one of the dyes present in the waste coming from the textile/dyeing industry. One way that can be done to handle the pollution of the aquatic environment by the presence of this dye is adsorption with activated carbon. The phosphoric acid activated carbon made from marigold stem has been reported to be usefull in decreasing Cu and Pb from dyeing wastewater. This study aimed to determine the adsorption capacity of phosphoric acid (15% H3PO4) activated carbon made from marigold stems to rhodamine B dye. The optimization of absorption conditions was done by determining the equilibrium time, adsorption isotherm and the effect of pH in adsorpting Rhodamine B. The results showed that the optimum adsorption conditions occurred at contact time for 90 minutes, in which the maximum adsorbate adsorped was as much as 2.3437 mg/g, pH 3 with an adsorption isotherm concentration of 120 mg/L, in which an amount of 2.2778 mg ansorbate was adsorped by a gram of adsorbent. The adsorption capacity at the optimum conditions was of 2.6320 mg/g. The adsorption process of the activated carbon in this study was classified as chemisorpsi with an adsorption energy of 27.4113 kJ/mol and followed the isotherm adsorption of Langmuir model with the linear coefficient (R2) of 0.8906.

KANDUNGAN Pb DAN Cr TOTAL DALAM AIR SERTA BIOAVAILABILITASNYA DALAM SEDIMEN DI PERAIRAN SUNGAI BEDADUNG JEMBER Wahyu Irwansyah; Emmy Sahara; Oka Ratnayani
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 7 No 2 (2019): volume 7, Nomor 2, 2019
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.231 KB)

ABSTRAK: Sungai Bedadung yang membelah kota Jember memiliki resiko terhadap pencemaran karena sungai ini digunakan sebagai tempat pembuangan sampah. Penelitian ini bertujuan untuk menentukan tingkat pencemaran dan bioavailabilitas Pb dan Cr dalam sedimen di perairan sungai Bedadung Jember. Digesti sampel dilakukan menggunakan campuran HNO3 dan HCl (3:1) dalam ultrasonic bath pada suhu 60 oC selama 45 menit dilanjutkan dengan pemanasan pada suhu 140oC selama 45 menit. Spesiasi dilakukan dengan metode ekstraksi bertahap. Konsentrasi Pb dan Cr dianalisis menggunakan Atomic Absorption Spectrofotometer (AAS) dengan metode adisi standar tunggal untuk sampel air dan kurva kalibrasi untuk sampel sedimen. Hasil penelitian menunjukkan bahwa konsentrasi Pb dan Cr total dalam air berturut-turut sebesar 0,1103 - 0,6151 mg/L dan 0,0287 – 0,1731 mg/L, sedangkan konsentrasi Pb dan Cr total dalam sedimen berturut-turut sebesar 1,7075 – 10,6026 mg/kg dan 2,5256 – 8,0493 mg/kg. Hasil spesiasi logam Pb dan Cr berturut-turut adalah sebagai berikut: fraksi EFLE sebesar td (tidak terdeteksi) hingga 6,5456 mg/kg dan 0,8662 – 3,2820 mg/kg, fraksi Fe/Mn oksida sebesar td hingga 2,6743 mg/kg dan 0,3528 – 2,8290 mg/kg, fraksi organik sulfida sebesar 0,3541 – 3,2564 mg/kg dan 0,2197 – 1,2285 mg/kg serta fraksi Resistant sebesar td hingga 3,8375 mg/kg dan 0,1111 – 0,5943 mg/kg. Dengan demikian, dapat diketahui bahwa logam Pb dan Cr yang bioavailable sebesar td hingga 61,74% dan 34,30 – 59,71%, yang berpotensi bioavailable untuk logam Pb sebesar td hingga 49,69% dan 9,77 – 35,15% untuk logam Cr, sedangkan logam Pb dan Cr yang non-bioavailable sebesar td hingga 58,68% dan 3,08 – 22,34%. Kata kunci: bioavailabilitas, Cr, Pb, sungai Bedadung Jember ABSTRACT: Bedadung River dividing the city of Jember faces the risk of pollution because of the fact that this river has become a waste disposal area. This study aimed to determine the level of pollution and bioavailability of Pb and Cr in sediments of the Bedadung Jember river. The sample digestion was carried out using the mixture of HNO3 and HCl (3:1) in an ultrasonic bath at 60 oC for 45 minutes followed by heating at 140 oC for 45 minutes. The speciation was carried out by four stages sequential extraction method. Pb and Cr concentrations in the solution were analyzed by using Atomic Absorption Spectrophotometer (AAS) with a single standard addition method for water samples and calibration curves for sediment. The results showed that the total Pb and Cr concentrations in the water were 0.1103 – 0.6151 mg/L and 0.0287 – 0.1731 mg/L, respectively, while the total Pb and Cr concentrations in the sediments were 1.7075 – 10.6026 mg/kg and 2.5256 – 8.0493 mg/kg, respectively. The results of the speciation for Pb and Cr metals were as follows: EFLE fraction of nd (undetectable) – 6.5456 mg/kg and 0.8662 – 3.2820 mg/kg, Fe/Mn oxide fraction of nd – 2.6743 mg/kg and 0.3528 – 2.8290 mg/kg, organic sulfide fraction of 0.3541 – 3.2564 mg/kg and 0.2197 – 1.2285 mg/kg and resistant fraction of nd – 3.8375 mg/kg and 0.1111 – 0.5943 mg/kg, respectively. From these results, it could be found that the bioavailable, potentially bioavailable and non-bioavailable of Pb and Cr were nd – 61.74% and 34.30 – 59.71%, nd – 49.69% and 9.77 – 35.15%; and nd – 58.68% and 3.08 – 22.34%, respectively.

PEMANFAATAN ARANG AKTIF DARI LIMBAH TANAMAN GUMITIR (Tagetes erecta) TERAKTIVASI ASAM FOSFAT SEBAGAI ADSORBEN ION Pb2+ DAN Cu2+ DALAM LARUTAN Emmy Sahara; Ni Putu Widyana Kartini; James Sibarani
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 5 No 2 (2017)
Publisher : Magister Program of Applied Chemistry, Udayana University, Bali-INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.849 KB)

ABSTRAK : Penelitian ini bertujuan untuk mengetahui kapasitas adsorpsi dari arang batang tanaman gumitir (Tagetes erecta) yang diaktivasi asam fosfat (H3PO4) 15% terhadap ion logam Pb2+ dan Cu2+. Arang yang belum dan sudah diaktivasi dikarakterisasi luas permukaan spesifiknya dengan metode adsorpsi terhadap metilen biru dan keasaman permukaannya dengan titrasi asam-basa. Optimasi kondisi penyerapan dilakukan dengan menentukan waktu setimbang, isoterm adsorpsi dan pengaruh pH terhadap kapasitas adsorpsi pada kedua logam. Hasil penelitian menunjukkan bahwa arang teraktivasi memiliki karakteristik yang lebih baik dari pada arang tanpa aktivasi. Arang teraktivasi memiliki luas permukaan dan jumlah situs aktif berturut-turut sebesar 36,4505 m2/g dan 37,1292x1020 molekul/gram sedangkan arang tanpa aktivasi memiliki luas dan jumlah situs aktif berturut-turut sebesar 28,2206 m2/g dan 29,9920x1020 molekul/gram. Waktu kontak terbaik untuk proses adsorpsi Pb2+ dan Cu2+ adalah 60 menit dengan nilai isoterm adsorpsi sebesar 150 mg/L. Kapasitas adsorpsi Pb2+ sebesar 5,0592 mg/g terjadi pada pH 3 sedangkan kapasitas adsorpsi Cu2+ sebesar 5,7867 mg/g terjadi pada pH 4. Proses adsorpsi arang batang gumitir teraktivasi H3PO4 dalam penelitian ini tergolong kemisorpsi dengan pola isoterm adsorpsi tipe Langmuir dengan nilai koefisien determinasi Pb2+ sebesar 0,9935 dan Cu2+ sebesar 0,9944. ABSTRACT : The aim of this study is to find out the adsorption capacity of the phosphoric acid (H3PO4)-activated marigold (Tagetes erecta) stem carbon in reducing Pb2+ and Cu2+ from their solutions. The activated carbon was characterized by determining its specific surface area using methylene blue adsorption method and the surface acidity by acid-base titration technique. Optimization of the absorption conditions was carried out by determining the equilibrium time, isotherm adsorption and the effect of pH on adsorption capacity on both metal ions. The results showed that activated carbon has better characteristics than carbon without activation. The activated carbon have a surface area and active sites of 36,4505 m2/g and 37,1292x1020 molecules/gram, respectively, while for carbon without activation of 28,2206 m2/g and 29,9920x1020 molecules/gram, respectively. The equilibrium time adsorption of Pb2+ and Cu2+ was 60 min and the adsorption isotherm value was of 150 mg/L. The adsorption capacity of Pb2+ at pH 3 was 5.0592 mg/g while the adsorption capacity of Cu2+ was 5.7867 mg/g at pH 4. The adsorption process of the H3PO4-activated carbon in this study was classified as chemisorption with adsorption pattern of Langmuir with determination coefficient for Pb2+ and Cu2+ are of 0.9935 and 0.9944, respectively.

BIOSORPSI Cr(III) PADA BIOSORBEN SERAT SABUT KELAPA TERAKTIVASI SODIUM HIDROKSIDA (NaOH) I Wayan Sudiarta; Emmy Sahara
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (210.779 KB)

Studies on biosorption of chromium (III) on NaOH-activated biosorbent of coconut coir fibre have been carried out. These studies included the determination of optimum concentration of NaOH for activating the biosorbent, the determination of biosorbent acidity, the optimum pH, the contact time of biosorption, and the adsorption isotherm type.The result showed that the NaOH optimum concentration for activation of coconut fiber was 1,2 M. The surface acidity of BBN and B00 were of 9,99 ± 0,17 and 3,17 ± 0,21 mmol/g respectively. The surface specific of BBN and B00 were of 20,21 and 19,14 m2/g respectively. The optimum pH of biosorption Cr(III) on BBN and B00 biosorbent was 3 and the contact time were 30, and 120 minutes. The type of isotherm adsorption for the biosorption of Cr(III) on BBN and B00 biosorbent was isotherm S.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BATANG LIMBAH TANAMAN GUMITIR DENGAN AKTIVATOR ZnCl2 E. Sahara; D. E. Permatasaari; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The agricultural waste of gumitir plants stem can be used as an ingredient in producing an activated carbon. Some researchers have reported that the additions of phosphoric acid and NaOH as chemical activators have resulted in an activated carbon that met the SNI (Indonesian National Standard) 06-3730-1995 about technical activated carbon. The purpose of this study was to produce and characterize the activated carbon from the stem of gumitir plants carbonized at 300oC for 90 minutes with the use of ZnCl2 as the activator. The activation was carried out by adding ZnCl2 to an amount of carbon in various mole ratios. The characteristics of the activated carbon obtained were compared to the SNI. It was evident that the addition of 0.1 mole of ZnCl2 to 1 gram of the carbon produced an activated carbon that met the SNI standard, namely, water content of 5.00%, as content of 8.33%, volatile content of 950oC of heating of 7.36%, carbon content of 79,30%, iodine absorption capacity of 788.1271 mg/g, and methylene blue absorption capacity of 260.7917 mg/g. The surface area and surfae acidity of this carbon was of 677,6270 mg2/g and 0.3396 mmol/g, respectively. The functional group analysis of this activated carbon showed the presence of O-H, COOH, C-O aldehyde, alkaline C-C and C-H groups.

KANDUNGAN LOGAM Pb DAN Cu TOTAL DALAM AIR, IKAN, DAN SEDIMEN DI KAWASAN PANTAI SERANGAN SERTA BIOAVAILABILITASNYA I Gusti Ngurah Raka Aryawan; Emmy - Sahara; Iryanti Eka Suprihatin
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Dalam paper ini dibahas mengenai kandungan logam berat Pb dan Cu dalam air laut, ikan, dan sedimen di kawasan Pantai Serangan beserta bioavailabilitasnya.Tujuan penelitian ini untuk menentukan konsentrasi kedua logam pada berbagai sampel dan melakukan spesiasi terhadap kedua logam tersebut dengan teknik ekstraksi bertahap sehingga bioavailabilitasnya dapat ditentukan. Destruksi untuk penentuan logam Pb dan Cu total dalam ikan dan sedimen dilakukan dengan menggunakan campuran pelarut H2SO4 dan HNO3 untuk ikan dan aqua regia untuk sedimen, sedangkan ekstraksi bertahap dilakukan dengan mengikuti 4 tahap ekstraksi dengan berbagai pelarut. Konsentrasi Pb dan Cu total dalam air laut di kawasan Pantai Serangan adalah berturut-turut sebesar 0,0389 ± 0,02 mg/L dan 0,0017±0,00 mg/L, dalam ikan sebesar 2,4248±1,11 mg/kg dan 1,5514±0,06 mg/kg dan dalam sedimen sebesar 32,3011 ± 3,02 mg/kg dan 9,1232±1,62 mg/kg. Hasil spesiasi untuk logam Pb dan Cu dalam sedimen berturut-turut sebagai berikut: fraksi EFLE sebesar 6,20% dan 1,55%; fraksi Fe/Mn oksida sebesar 12,03% dan 1,01%; fraksi organik sulfida sebesar 31,77% dan 20,04% serta fraksi resistant sebesar 50,00% dan 77,40%. Dengan demikian maka fraksi bioavailabel dalam sedimen untuk Pb dan Cu adalah berturut-turut sebesar 50,00% dan 22,60% sedangkan fraksi resistant nya sebesar 50,00% dan 77,40%

Title

Found 31 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 31 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 31 Documents
Search