지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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초록· 키워드
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The solvent extraction and determination of trace amount of lead(Pb) were studied. By adding 0.15% APDC (ammonium Pyrrolidine dithiocarbamate) solution to the sample solution of pH 1 acidified with nitric acid, Ph-PDC chelate was formed. The chelate was extracted with the mixed solvent of MIBK(methylisobutyl ketone) and toluene (volume ratio of 1:1). And the extracted lead was determined by air-acetylene flame atomic absorption spectrophotometry. The amount of APDC more 50 times than the moles of lead should be added to the sample solutions in order to extract it effectively.
Interfering effects of Ca(Ⅱ) and other ions were investigated on the extraction and determination processes. The extraction was not interfered by Ca(Ⅱ), Fe(Ⅱ), AI(Ⅲ), Zn(Ⅱ), CO₃^(2-) and PO₄^(3-) up to the amount of 100 times Pb(Ⅱ) content. But Fe(Ⅲ), Cu(Ⅱ) and Cd(Ⅱ) interfered the extraction of PbPDC with the mixed solvent. The interference of Fe(Ⅲ) could be eliminated by reducing Fe(Ⅲ) to Fe(Ⅱ) with 2% ascorbic acid solution. And the competitive reactions of Cu(Ⅱ) and Cd(Ⅱ) were overcome with an excess APDC of more 10 times than the moles of Cu(Ⅱ) and Cd(Ⅱ), respectively. Especially, the major ('ontent of Ca(Ⅱ) increased the background on measuring the absorbance of lead, but the background was completely removed by mean of this extraction method.
The recoveries of 500 and 1000 ng/ml Pb(Ⅱ) added in synthetic Ca(Ⅱ) solutions were over 98% and their relative standard deviation were 4.45% and 5.73% for the stClndard addition method.
Interfering effects of Ca(Ⅱ) and other ions were investigated on the extraction and determination processes. The extraction was not interfered by Ca(Ⅱ), Fe(Ⅱ), AI(Ⅲ), Zn(Ⅱ), CO₃^(2-) and PO₄^(3-) up to the amount of 100 times Pb(Ⅱ) content. But Fe(Ⅲ), Cu(Ⅱ) and Cd(Ⅱ) interfered the extraction of PbPDC with the mixed solvent. The interference of Fe(Ⅲ) could be eliminated by reducing Fe(Ⅲ) to Fe(Ⅱ) with 2% ascorbic acid solution. And the competitive reactions of Cu(Ⅱ) and Cd(Ⅱ) were overcome with an excess APDC of more 10 times than the moles of Cu(Ⅱ) and Cd(Ⅱ), respectively. Especially, the major ('ontent of Ca(Ⅱ) increased the background on measuring the absorbance of lead, but the background was completely removed by mean of this extraction method.
The recoveries of 500 and 1000 ng/ml Pb(Ⅱ) added in synthetic Ca(Ⅱ) solutions were over 98% and their relative standard deviation were 4.45% and 5.73% for the stClndard addition method.
목차
ABSTRACT
1. 서 론
2. 실 험
3. 결과 및 고찰
4. 결 론
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