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All Journal Jurnal Penelitian Saintek INOTEKS : Jurnal Inovasi Ilmu Pengetahuan, Teknologi, dan Seni
Siti Sulastri
Universitas Negeri Yogyakarta
Arts Humanities Computer Science & IT Decision Sciences, Operations Research & Management

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EFFECT OF MALELO SANDAL SALT WITH HN03 TO THE EFFICIENCY OF CRYSTAL IMPLEMENTATION Siti Sulastri; Susila Kristianingrum; Retno Arianingrum
Jurnal Penelitian Saintek Vol 9, No 1: April 2004
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (12814.019 KB) | DOI: 10.21831/jps.v9i1.5553

Abstract

The  objective   of  this  study   was  to  investigate    the  effect  of  soaking nitrate  acid  of Malelo  sand  to adsorption   efficiency   of chromium  (Cr). The Malelo  sand  was prepared   by soaking   in nitric  acid with variation of  concentration     were   17,5:  35  and   70%  for    24  hours   at  room temperature.    The  adsorption   efficiency   of  chromium   was  determined based  on concentration    of chromium   residue   after  adsorption.   which measured  using Atomic Absorption  Spectrophotometer    (AAS). The characterization    of Malelo  sand  determined   using  FTIR  and XRD.  The result  indicated  that the mean  ofadsorption    efficiency   of chromium  on Malelo   sand   without   preparation    and  soaking   in  nitrate   acid  with variation   concentration    17.5:  35 and  70%  were  91,36:  92,40:  92,72 and 94,004%  respectively.
PEMANFAATAN LIMBAH KULIT lKAN MENJADI KERUPUK (RAMBAK) Susila Kristianingrum; Retno Arianingrum; Siti Sulastri
INOTEKS : Jurnal Inovasi Ilmu Pengetahuan, Teknologi, dan Seni Vol 10, No 1 (2006): Februari 2006
Publisher : LPPM UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6961.798 KB) | DOI: 10.21831/ino.v10i1.5136

Abstract

This   program   of  implementation    Science,   Technology    and  Arts (Ipteks)  intended  to  introduce  and  give  skill  training  about  making  chips from  fish skins (kerupuk  kulit  ikan)  to the community   in Tanjungsari   Sub­ district,  Gunungkidul   Regency.  In this  area,  there  are  plenty  of  fish  skins that can pollute  and disturb  the beauty  of the environment.   Producing  chips from fish skins can reduce the pollutant  and increase  the value of fish skins.The  program   was  held  by  giving   information   and  demonstration methods  in two locations  with different  participants.   The first program  was held  in Tanjungsari  Sub-district   Hall  for 35 participants,   who  were  village chiefs'    wives.   The   second   program   was   held   at  Baron   beach   hall   to accommodate  20 participants,  consisting  of fishermen's   wives and members of youth group.The questionnaire  result  of first program  showed  that  85.71 % of theparticipants   considered  this  program  profitable   and  74.28%  said  that  they were  interested  to  develop  business  in  producing   fish  skin  chips.  All  the participants   (100%)   of  the  second   program   said  that   the  program   was profitable  and  they  were  interested  to  develop   business   in producing   fish skin  chips.  Thus,  the  program   succeeded   in  broadening   the  participants' perspectives  and  skills  on how  to make  use  of   waste,  turning  it into fish skin  chips  and  to  motivate  the  participants   to  develop   business  using  the knowledge  and skills already obtained.Key words:fish skin waste.fish skin drips
THE EFFECT OF pH ON THE ADSORPTION OF MICRONUTRIENT CATIONS OF Ca 2+ AND K + BY SILICA FROM LAPINDO MUD Jaslin Ikhsan; Siti Sulastri; Erfan Priyambodo
Jurnal Penelitian Saintek Vol 20, No 1: April 2015
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1406.394 KB) | DOI: 10.21831/jps.v20i1.5603

Abstract

The aim of this research was to determine the effect of pH on the adsorption of micronu- trients of Ca 2+  and K . by silica from lapindo mud. Data were collected by the adsorption experiments, on which 3 grams of silica separated from Lapindo mudwere dissolved in 300 mL of 0.0001 or 0.001 M Ca + 2+ or K ., and stirred for 2 hours. The pH of suspension was varied and left for equilibrate for 2 hours, and a sample was taken and measured for free concentration of K + + .cation  using Flame Atomic Emission Spectroscopy and of Ca  using Atomic Absorption Spectroscopy (AAS). The pH ranges were from 3 to 10. Temperature o  30 C and contact time of 2 hours were maintained. The research showed that both cations were adsorbed in sigmoid curve, increased with increasing pH values. In entire ranges of observed pH, the percentage of cations adsorbed by silica was not different signifi cantly. The adsorbent of silica formed silanol (SiOH) in water. The –OH groups of silica were protonated forming SiOH o at lower pH and deprotonated forming SiO¯ at higher pH. Wether Ca 2+  or K + 2 + . cations were bound to silica surfacesvia cation exchange reactions, on which Ca2+ or K + . exchanged H of SiOH using one charge of the cations, forming [SiO(CaO)] for Ca 2+ , and [SiO-K] for K
Co-Authors Erfan Priyambodo Jaslin Ikhsan Retno Arianingrum Susila Kristianingrum