分析试验室
分析試驗室
분석시험실
ANALYTICAL LABORATORY
2009年
12期
22-25
,共4页
分光光度法%汞%铬蓝黑R%镍%H_2O_2
分光光度法%汞%鉻藍黑R%鎳%H_2O_2
분광광도법%홍%락람흑R%얼%H_2O_2
Spectrophotometry%Mercury%Palatine chrome black%Nickel%Hydrogen peroxide
采用催化过氧化氢氧化Ni(Ⅱ)-铬蓝黑R络合物光度法测定汞,通过优化对比实验,确定最佳反应条件为在pH 4.12的HAc-NaAc缓冲溶液中,以2.00 mL4g/L聚乙烯醇(PVA)作表面活性剂,5.00 mL H_2O_2(1+9)溶液可氧化1.00 mL0.001 mol/L Ni~(2+)溶液与1.00 mL 0.400g/L铬蓝黑R溶液反应生成的Ni(Ⅱ)-铬蓝黑R络合物,75℃水浴加热,汞对该反应具有明显催化作用.在波长571 nm处催化体系和非催化体系的吸光度差值最大.Hg(Ⅱ)在0.1～2.0g/L范围内符合朗格一比尔定律,检出限为3.2×10~(-9)g/L.经实际水体样本论证,本法可用于自然水体中痕量汞的直接测定.
採用催化過氧化氫氧化Ni(Ⅱ)-鉻藍黑R絡閤物光度法測定汞,通過優化對比實驗,確定最佳反應條件為在pH 4.12的HAc-NaAc緩遲溶液中,以2.00 mL4g/L聚乙烯醇(PVA)作錶麵活性劑,5.00 mL H_2O_2(1+9)溶液可氧化1.00 mL0.001 mol/L Ni~(2+)溶液與1.00 mL 0.400g/L鉻藍黑R溶液反應生成的Ni(Ⅱ)-鉻藍黑R絡閤物,75℃水浴加熱,汞對該反應具有明顯催化作用.在波長571 nm處催化體繫和非催化體繫的吸光度差值最大.Hg(Ⅱ)在0.1～2.0g/L範圍內符閤朗格一比爾定律,檢齣限為3.2×10~(-9)g/L.經實際水體樣本論證,本法可用于自然水體中痕量汞的直接測定.
채용최화과양화경양화Ni(Ⅱ)-락람흑R락합물광도법측정홍,통과우화대비실험,학정최가반응조건위재pH 4.12적HAc-NaAc완충용액중,이2.00 mL4g/L취을희순(PVA)작표면활성제,5.00 mL H_2O_2(1+9)용액가양화1.00 mL0.001 mol/L Ni~(2+)용액여1.00 mL 0.400g/L락람흑R용액반응생성적Ni(Ⅱ)-락람흑R락합물,75℃수욕가열,홍대해반응구유명현최화작용.재파장571 nm처최화체계화비최화체계적흡광도차치최대.Hg(Ⅱ)재0.1～2.0g/L범위내부합랑격일비이정률,검출한위3.2×10~(-9)g/L.경실제수체양본론증,본법가용우자연수체중흔량홍적직접측정.
A new catalytic kinetic spectrophotometric determination of trace mercury(Ⅱ) based on its catalytic oxidiz-ing discoloration reaction of nickel(Ⅱ)-palatine chrome black complex by 5.00 mL of 3.0% hydrogen peroxide with 2.00 mL of 0.4% polyvinyl alcohol (PVA) as an activating agent in the presence of acetic acid-sodium acetate buffersolution of pH 4.12. The maximum absorbance difference of catalytic system and non-catalytic system appears at 571 nm. The beer's law is well obeyed in the range of 0.1～2 μg/L for mercury, and the detection limit is 3.2 × 10~(-9) g/L. The method is free from interference of common ions after extraction separation, and it has been ap-plied to the determination of trace amounts of mercury in water.
