Claim Missing Document
Check
Articles

Found 28 Documents
Search

Dynamic Model of Land Use Change in Landslide Hazard Zones in Tanah Datar District, West Sumatra Dewata, Indang
Sumatra Journal of Disaster, Geography and Geography Education Vol 3 No 1 (2019): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (503.595 KB) | DOI: 10.24036/sjdgge.v3i1.194

Abstract

Population growth has an impact on land resource needs, pressure on land use will have an impact on environmental degradation. As an effort to reduce pressure, policy efforts in land use are needed. This study aims to develop dynamic models in land use and develop land use policy direction.The method used in dynamic modeling uses system analysis and land change policy direction using ISM analysis. In dynamic modeling, land use change uses three scenarios, namely: optimistic scenario, muder scenario, and pessimistic scenario. In determining the direction of the policy involving all stakeholders as many as 15 experts. The results of dynamic model analysis show that forest area changes from time to time of 1.6 percent per year. Changes in forest areas will have an impact on increasing environmental disasters. As an effort to save the environment, there is a need for law enforcement and strict sanctions against perpetrators of forest area destruction
Evaluation Model for WWTP Feasibility Palm Industry in West Sumatera Dewata, Indang
Sumatra Journal of Disaster, Geography and Geography Education Vol 3 No 2 (2019): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.096 KB) | DOI: 10.24036/sjdgge.v3i2.245

Abstract

This research is motivated by the collapse of the WWTP pool PT. Binapratama Sakatojaya South Solok, namely pond Anaerobic pond 2 which occurs due to very high rainfall and lasts a long time, so that the embankment cannot hold the volume and discharge of wastewater at that time. The company is required to repair the broken embankment and conduct a feasibility study of the embankment conducted by the independent PPKLH UNP team. The purpose of this study is to analyze and provide recommendations on the feasibility of WWTP PT. Binapratama Sakatojaya South Solok. Primary data collection is done by surveying the location of the study, water sampling, testing the quality of wastewater, ground water and surface water and soil sampling. Secondary data used include maps (administrative maps, maps of plantation locations, and maps of PT. Binapratama Sakatojaya Selatan Solok and land applications). The research findings reveal: (1) There was no water pollution from the analyzed water samples either wastewater, ground water and surface water which were sampled on June 20, 2019. (2) Making wooden pile on the inside of the embankment that serves to hold the soil or restrain the entry of water into the dug hole. (3) The embankment used has met the strong requirements for shear and rolling both in conditions without earthquake loads and with earthquake loads.
Disaster Mitigation of Mount Sinabung in Karo District, North Sumatra Province Barlian, Eri; Dewata, Indang; Umar, Iswandi; Muchtar, Bustari; Anwar, Syafri
Sumatra Journal of Disaster, Geography and Geography Education Vol 3 No 2 (2019): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (319.049 KB) | DOI: 10.24036/sjdgge.v3i2 - 1.287

Abstract

The volcanic eruption of Mount Sinabung has caused the loss of human lives. Hence, for minimizing losses, disaster mitigation is needed. The purpose of this study is to determine the policy directives in mitigating volcanic eruptions of Mount Sinabung. The method to determine the volcano hazard area is the assessment method using geographic information system techniques. Indicators in determining the hazard level are slope, soil type, geology, landform, vegetation, and land use. As for determining the policy directive, this study used the AHP method. The results show that 45 percent of the area is a high risk of the volcano hazard area. From the research, the appropriate policy directive for mitigation is relocating the area further from the volcano.
Penentuan Kapasitas Serapan Ion Fosfat oleh Sedimen Limbah Tambang Batu Kapur di Bukit Karang Putih Indarung Padang Maya, Gustia Dona; Dewata, Indang; Hardeli, Hardeli
Periodic Vol 1, No 2 (2012)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.595 KB) | DOI: 10.24036/p.v1i2.2517

Abstract

Telah dilakukan penelitian tentang penentuan kadar logam Ca, Al, Fe dan uji kapasitas serapan ion fosfat oleh sedimen limbah tambang batu kapur di bukit karang putih. Pemilihan lokasi pengambilan sampel berdasarkan atas teknik random yang terserbar menjadi 7 titik sampling antara lain, satu titik dihulu, dua titik di lingkungan tambang, dua titik di Sungai Batang Idas dan dua titik di hilir. Hasil penelitian di dapatkan kadar logam Ca dalam persen (%) pada 7 titik sampel berturut-turut adalah sebagai berikut 0,27; 29,67; 29,97; 27,97; 11,28; 9,75; 2,94, dan kadar logam Al dalam persen pada 7 titik sampel berturut-turut adalah 0,025; 0,027; 0,035; 0,036; 0,038; 0,039; 0,041, serta kadar logam Fe dalam persen pada 7 titik sampel berturut-turut adalah 4,15; 1,37; 2,24; 2,07; 3,51; 3,04; 3,17. Kapasitas serapan ion fosfat dalam mg/g pada 7 titik sampel berturut-turut adalah sebagai berikut 6,1; 3,1; 100; 0,4; 2,4; 2,2; 2,9 m. Kesimpulan, kadar logam Ca lebih tinggi bila dibandingkan dengan logam Al dan Fe sehingga logam Ca berperan dalam penyerapan ion fosfat. Terbukti dari analisis korelasi menunjukkan bahwa logam Ca berkorelasi positif dengan Qmaks, sedangkan dengan logam Al dan Fe berkorelasi negatif. Pemodelan isoterm Langmuir lebih tepat dari pada pemodelan isoterm Freundlich karena kapasitas serapan ion fosfat (Q maks) dan regresi (R2) nya lebih tinggi yaitu berturut-turut 100 mg/g dan 0,997mg/g.
Studi Kopresipitasi Co(II) Menggunakan Kopresipitan Al(OH)3 Secara Spektrofotometri Serapan Atom (SSA) Yulia, Monika; Dewata, Indang; Nasra, Edi
Periodic Vol 2, No 2 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.619 KB) | DOI: 10.24036/p.v2i2.3034

Abstract

Has conducted research on the study of coprecipitation Co(II) using copresipitan Al(OH)3 by Atomic Absorption Spectrophotometry. This study aims to find the optimum conditions such as pH coprecipitation, volume of coprecipitan and the volume of nitric acid as eluent and to see efect of Ni(II) to coprecipitation Co(II). Results of analysis using SSA coprecipitation prove that the optimum conditions obtained in a relatively at base pH of the solution that is pH 8, where the condition is colloidal Al(OH)3 formed maximum. At acidic pH colloid formation process is not maximized, while at higher pH colloids formed will dissolve again into tetra hidroksoaluminat ions. Maximum Coprecipitan volume occurs at 12 mL Al3+ 0,2 M, which is the case in vulome maximum absorption of  Co2+ 50 mL 1 ppm by 2,0 mmol colloidal Al(OH)3 while at higher volumes there is a reduction of the metal cation uptake due to competition between the Al metal is more electropositive and have fingers ion is smaller than the cations Co(II). The optimum conditions of volume nitric acid as eluent  occurred on volume of 1 mL with absorption capacity by Al3 was 0.0905 mg / g, where as in the volume of eluent managed to extract maximum metal cations while the volume is higher dilution solution causes a decrease in the concentration of metal cations soluble in the eluent. The addition of nickel metal ions affect coprecipitation of metal kobalt  because cobalt and nickel  is a 3d transition which has a tendency of the same characteristic.
Analisa Kualitas Air Sungai Batang Idas Kecamatan Lubuk Kilangan Indarung Padang pada Bulan Desember 2011 dan Maret 2012 Hardianti, Melisa Sri; Dewata, Indang; Hardeli, Hardeli
Periodic Vol 1, No 2 (2012)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (552.886 KB) | DOI: 10.24036/p.v1i2.2520

Abstract

Has done research about determination water quality in Batang Idas River at December 2011 to Maret 2012 with purpose to knows degree of water pollution with doing analisys of temperature, DHL, TSS, TDS, pH, DO, BOD, COD, an analisys consentration of Fe, Ca, and Al metal in water and sediment. The next preposition with rule government number of 82, 2001th and it evaluated. Result of experiment look that weather sampling time can influence the result. I got some parameter concentration from low value to high value are temperature is 22-300C, pH is 6.1-8.6, DHL is 0.078-0.201 mS/cm, TSS is 108-6149 mg/l, TDS is 39-130.78 mg/l, DO is 7.39-12.73 mg/l, BOD is 0.65-2.17 mg/l, COD is 1.71-74.31 mg/l, Fe metal is 0.3-119.6 ppm,  Ca metal is 9.34-5371 ppm,  Al metal is 5.2-7.26 ppm, and total concentration metal in sedimentis 0.019-46.61 %.  The average concentration of some parameter exist under limit certainty rule government number of 82, 2001th except to COD in area 2, 3 and TSS in area 2, 3 and 4. Concentration of metal past over limit RMC (Recommendation Maximun Concentration for Water Irrigation). The conclusion that even increase concentration some parameter in mine area and followed increase concentration some parameter in Batang Idas River and in sail down than to rise.  The reason is waste from mine limestone area, activity of human, and erosion of land.
Studi Kopresipitasi Zn2+ Menggunakan Al(OH)3 sebagai Kopresipitan Wizul, Yollafebrisa; Dewata, Indang; Nasra, Edi
Periodic Vol 2, No 2 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (264.994 KB) | DOI: 10.24036/p.v2i2.3003

Abstract

Research of study copresipitation Zn2+ using Al(OH)3 as coprecipitant has been done. This study aims to determine the optimum conditions for coprecipitation of Zn2+ by Al(OH)3, and influence of foreign ions. This study uses variation pH about 5,0 – 10,0;  variation of eluent volume about 8,0 – 14,0; variation of concentrated HNO3 volume about 1,0 – 5,0; and variation of concentration Cu2+ about 0,8; 1,2; 1,6; 2,0 and 2,4. Measurement concentration of Zn2+ using Atomic Absorption Spectroscopy (AAS) with wavelength of 213,9 nm. The result showed the optimum conditions occur at pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,074 mg/g. Meanwhile, the presence of foreign ions such as Cu2+ has influenced the coprecipitated Zn where concentration of the coprecipitated Zn decreased with increasing the concentration of foreign ions.
Studi Co-Precipitation Tembaga (II) Menggunakan Coprecipitant Al(OH)3 pada Sungai Batang Arau Kota Padang Diukur dengan Metoda Spektrofotometri Serapan Atom (SSA) ., Yusuf; Dewata, Indang; Nasra, Edi
Periodic Vol 2, No 1 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (246.031 KB) | DOI: 10.24036/p.v2i1.1930

Abstract

A study in the development co-precipitation method and natural samples was applied to the Batang Arau River in Padang City. Sampling was done once in the month of November 2012, by random sampling on the selected point along the river which was considered to represent the river. Sampling points taken in the river upstream Lubuk Paraku Kor were named sample 1, the sampling points in the middle of the river called hilalang padang besi were called as sample 2, the third sampling points downstream to the mouth of the river were called the sample stream 3. The analysis was performed with the optimization of pH and volume optimization before it was applied to the sample. The result was the determination of the optimum pH conditions co-precipitant Al(OH)3 with atomic absorption spectroscopy air acetylene flame occurred at pH 6, the optimum volume coprecipitant used in the co-precipitation method was the addition of Al(OH)3 as much as 11 mL. Content of Copper (II) obtained at the optimum conditions at upstream was 2,22ppm, in the middle of the river was 1,294 ppm and 1,2 ppm was the content at the river mouth, with an average concentration factor of 104 times compared to direct measurement without the co-precipitation. Quality Standards based on PP. 82 Year 2001 Class II was still in the limited threshold 0,02 ppm.
STUDI KOPRESIPITASI Zn2+ MENGGUNAKAN Al(OH)3 SEBAGAI KOPRESIPITAN Dewata, Indang; Nasra, Edi; Wizul, Yollafebrisa
Sainstek : Jurnal Sains dan Teknologi Vol 5, No 1 (2013)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (869.978 KB) | DOI: 10.31958/js.v5i1.83

Abstract

Research of study copresipitation Zn2+ using Al(OH)3 as coprecipitant has been done. This study aims to determine the optimum conditions for coprecipitation of Zn2+ by Al(OH)3, and influence of foreign ions. This study uses variation pH about 5,0 ? 10,0;  variation of eluent volume about 8,0 ? 14,0; variation of concentrated HNO3 volume about 1,0 ? 5,0; and variation of concentration Cu2+ about 0,8; 1,2; 1,6; 2,0 and 2,4. Measurement concentration of Zn2+ using Atomic Absorption Spectroscopy (AAS) with wavelength of 213,9 nm. The result showed the optimum conditions occur at pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,074 mg/g. Meanwhile, the presence of foreign ions such as Cu2+ has influenced the coprecipitated Zn where concentration of the coprecipitated Zn decreased with increasing the concentration of foreign ions.Keywords: coprecipitation, coprecipitant Al(OH)3, trace metal,  Zn, AAS 
STUDI KOPRESIPITASI Zn2+ DAN Co2+ MENGGUNAKAN Al(OH)3 SEBAGAI KOPRESIPITAN Dewata, Indang
Sainstek : Jurnal Sains dan Teknologi Vol 5, No 1 (2013)
Publisher : IAIN Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1314.803 KB) | DOI: 10.31958/js.v5i1.79

Abstract

Research of study copresipitation Zn2+ using Al(OH)3 as coprecipitant has been done. This study aims to determine the optimum conditions for coprecipitation of Zn2+ by Al(OH)3, and influence of foreign ions. This study uses variation pH about 5,0 ? 10,0 and 6,0 ? 10,0 for Co2+;  variation of eluent volume about 8,0 ? 14,0; variation of concentrated HNO3 volume about 1,0 ? 5,0; and variation of concentration Cu2+ and Ni2+ about 0,8; 1,2; 1,6; 2,0 and 2,4, respectively. Measurement concentration of Zn2+ using Atomic Absorption Spectroscopy (AAS) with wavelength of  213,9 nm Zn2+for 240,7 nm for Co2+. The result showed the optimum conditions occur at pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,074 mg/g for Zn2+ and pH about 8, 12 mL of eluent and 1 mL of concentrated HNO3 with the absorption capacity of 0,0905 mg/g for Co2+. Meanwhile, the presence of foreign ions such as Cu2+ has influenced the coprecipitated Zn where concentration of the coprecipitated Zn decreased with increasing the concentration of foreign ions.Keywords:  coprecipitation, coprecipitant Al(OH)3, trace metal,  Zn, Co, AAS