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UTILIZATION OF COPPER WEIGHT METAL ION (II), KROMIUM (III), TIMBAL (II), AND SENG (II) IN LIQUID WASTE INDUSTRY FOR ELECTROPLATING IRON COATING Marwati, Siti; Padmaningrum, Regina Tutik; Marfuatun, Marfuatun
Jurnal Penelitian Saintek Vol 14, No 1: April 2009
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v14i1.691

Abstract

This Research aim to  know:  1) the potential difference which can degrade the heavy metal ion concentration of Cu(II), Cr(III), Pb(II), and Zn(II) in liquid waste of electroplating maximally, 2) the efficiency of degradation of heavy metal ions concentration of Cu(II), Cr(III), Pb(II), and Zn(II) in liquid waste of electroplating at optimal potential difference, and 3)the potential difference yielding the nicest coat quality pursuant to its physical appearance.This research early with the preparation electroplating: 1) the preparation of sample liquid waste, 2) platinum electrode,and 3) iron metal to be arranged in layers. The instrument of this research is potentiometers Shimadzu NES_5F. Process the electroplating has been done at variations of potential difference that are 2.0; 2.5; 3.0; 3.5; 4.;, 4.5; and 5.0 V. Analysis of concentration of metal ions in liquid waste of electroplating  before and hereafter process the electroplating have been done by atomic absorbtion  spectrophotometric (AAS). Perception result of coating have been done visually by researcher. The result of this research are 1) the potential differences which can degrade the heavy metal ions concentration of Cu(II), Cr(III), Pb(II), and Zn(II) in liquid waste of electroplating maximally is 4 V, 2) efficiency of degradation of heavy metal ions concentration of Cu(II), Cr(II), Pb(II), and Zn(II) in liquid waste of electroplating at optimal potential difference successively are 21.30; 72.37; 51.00; and 58.60 %, and 3) potential difference yielding the nicest coat quality pursuant to its physical appearance is 4 V.
USE OF PRESIPITATION METHODS TO REDUCE CU IN THE LIQUID WASTE INDUSTRY LIQUID IN KOTAGEDE Handoko, Chanel Tri; Yanti, Tri Budi; Syadiyah, Halimatus; marwati, siti
Jurnal Penelitian Saintek Vol 18, No 2: Oktober 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v18i2.2140

Abstract

This research was to determine the optimal pH decreased level of Cu using precipitation method and effectivity of the reduction Cu metal level using lime solution as precipitatingagent. The research was conducted by collecting the silver industrial wastewater samples from 3 different places, analyzing the initial Cu level, precipitation treatment of the sample, and analyzing the Cu level after precipitation process. Precipitation process was done by reacting the waste water sample and a solution of Ca(OH)2 0.2 M at pH variation of 7, 8, 9, 10, and 11, then allowed to settle for 24 hours. Then the optimal pH of the experiment was used as a pH in the precipitation process using 5% lime solution.  Analysis of the Cu metal level in this study was using AAS instrument. Sample C has pH value =10.3 (alkaline), so no further precipitation process is carried out on sample C. Optimal pH precipitation to decresase Cu level is 8. Cu level after treatment precipitation using 5% lime solution at pH 8 is 0.6583 ppm for sample A and 0.4697 ppm for sample B. When compared with the initial Cu level it is 28132.7430 ppm for sample A and 11233.467 ppm for sample B, the precipitation method using lime solution effective to reduce Cu level. 
RECOVERY OF GOLD (Au) AND SILVER (Ag) METALS IN THE ELECTRONIC WASTE THROUGH MULTILEVEL PRECIPITATION PROCESS Marwati, Siti; Padmaningrum, Regina Tutik; Sunarto, Sunarto
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (121.655 KB)

Abstract

This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as CD-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process. The first step was the optimization of the concentration of thiourea and time dissolution of gold and silver in the sample. The concentration of thiourea and the time dissolution optimum obtained from conentration of gold and silver maximum. By The percent recovery of gold and silver are determined by comparing the concentration of gold and silver between in the solution sample and in the sample without dissolution that be analyzed by XRF. The scond step was the multilevel precipitation process and calcination. Precipitation and calcination of the filtrat was dissolution results in the optimum condition. Reagent used was a solution of hydrochloric acid and potassium carbonate. The precipitation gold and silver produced from the precipitation of dissolution again and then be analyzed by atomic absorption spectrophotometry. The purity was determined by comparing the weight of gold and silver between in the precipitate and in the solution.  The results of this research showed that the percent recovery of the silver in the CD-RW through the process dissolution with thiourea 10 g/L and 4 hours soaking time were 21.09 %. The purity silver preipitate were 0.15 %. The percent recovery and the purity of gold can  not be determined because the gold contained in the sample were not detected or below the limit of detection equipment. Keywords: recovery, gold, silver, electronic  waste
VALIDATION OF CYCLAMATE ANALYSIS METHOD WITH SPECTROPHOTOMETRY AND TURBIDIMETRY Padmaningrum, Regina Tutik; Marwati, Siti
Jurnal Sains Dasar Vol 4, No 1 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (99.479 KB)

Abstract

This research aims to validate methods of analysis by spectrophotometry and turbidimetry cyclamate in the sample drink mango-flavored jelly drink  by spectrophotometry with hypochlorite reagent, ultraviolet spectrophotometry (without reagent) and turbidimetry. The object of research was the validity parameters spectrophotometric method were linearity, linear range, the limit of detection, limit of quantitation, precision, and accuracy. The calibration curve of standard solution of sodium cyclamate in the spectrophotometric method with hypochlorite reagent, UV spectrophotometry (without reagent), and turbidimetry are linear. Linear range each method respectively at a concentration were (211.36-747.08); (16.000-146.434); and (1.8521-6.1717) ppm. The detection limit of each method successively were 53.6028; 0.5833; and 0.2723 ppm. Limit of quantitation each method successively were 66.9948; 1.9443; and 0.8068 ppm. Spectrophotometric analysis method cyclamate with hypochlorite reagent had good precision and accuracy. Ultra violet  spectrophotometric analysis method of cyclamate have a good precision but the accuracy was not good. Turbidimetric methods  analysis of cyclamate had  precision and accuracy were not good.Keywords:   method validation, spectrophotometry, turbidimetry, cyclamate
OPTIMIZATION OF CONDITION ION CU2+ ELECTRODEPOSITION IN ELECTROPLATING LIQUID WASTE WITH FORMALDEHYDE AS REDUCING AGENT Marwati, Siti; Padmaningrum, Regina Tutik
Jurnal Sains Dasar Vol 5, No 1 (2016): Jurnal Sains Dasar
Publisher : Yogyakarta State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jsd.v5i1.12670

Abstract

Abstract The aims of this research to determine of the optimum of formaldehyde concentration, teh optimum of electrodeposition time and the optimum pH of solution. In addition, this research also   aims to determine the character Cu deposite at optimum operational. The sample in this research was used   real electroplating liquid waste from Kotagede Yogyakarta.done at various formaldehyde concentration Electrodeposition was done at various formaldehyde concentration, electrodeposition time and varoius of pH. The optimum conditions could be seen  the  maximum efficiency. It could be obtained by measuring the final concentration of Cu2+ after electrodeposition process by  Atomic absorption spectrophotometry. The character of deposit could be seen by  visual and X-ray Diffraction. The result  of this research showed that the optimum of formaldehyde concentration as reducing  agent was 0.3 M. the optimum time was 4 hours and the optimum of  pH 9. The character of deposte was contained  Cu deposite and more subtle than deposite which electrodeposited without formaldehyde. Keywords: electrodeposition, formaldehyde, reducing agent