5-Br-PADAP共振光散射法测定水中镉
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摘要
建立了一种快速、准确测定水中镉含量的共振光散射(RLS)方法。在pH=9.0的氨-氯化铵缓冲介质及表面活性剂十二烷基硫酸钠(SDS)存在下,镉(II)与2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚(5-Br-PADAP)可形成复合物,导致体系共振光散射强度显著增加,据此建立了利用共振光散射技术测定镉含量的分析方法。在优化条件下,依次加入0.40 mL的pH=9.0的NH_3-NH_4Cl缓冲溶液,0.10 mL的1.0 mmol/L 5-Br-PADAP溶液,适量镉(II)标准使用液,以及0.40 mL的1.0 mmol/L SDS水溶液,并定容至10.0 mL,于室温下反应10 min,在最大散射峰604 nm处测定共振光的散射信号。结果表明,共振光散射强度与镉(II)质量浓度在5.3～200.0μg/L范围内呈线性关系,检出限(3S_d/K)为0.1μg/L。
A resonance light scattering(RLS) method for the rapid and accurate determination of Cadmium in water was developed.In an ammonia-ammonium chloride buffer medium at pH 9.0 and in the presence of surfactant sodium dodecyl sulfate(SDS),Cadmium(II) reacted quickly with 2-[(5-bromine-2-pyridine)-azo]-5-diethylaminophenol(5-Br-PADAP) and formed a complex,which led to a distinctly enhancement of resonance light scattering signal of system.Accordingly,an analysis method of Cadmium content using resonance light scattering was established.Under optimized conditions,0.40 mL of ammonia-ammonium chloride buffer solution at pH 9.0,0.10 mL of 1.0 mmol/L 5-Br-PADAP solution,proper amount of Cadmium(II) standard solution and 0.40 mL of 1.0 mmol/L SDS were added successively into a colorimetric tube and diluted to 10.0 mL.After reaction at room temperature for 10 min,the resonance light scattering signals were determined at maximum scattering peak of 604 nm in 1 cm quartz cuvette.The results indicated that in the largest scattering peak at 604 nm,the resonance light scattering intensity was directly proportional to the mass concentration of Cadmium(II) in the range of 5.3 μg/L to 200.0 μg/L with a detection limit(3S_d/K) of 0.1 μg/L.
A resonance light scattering(RLS) method for the rapid and accurate determination of Cadmium in water was developed.In an ammonia-ammonium chloride buffer medium at pH 9.0 and in the presence of surfactant sodium dodecyl sulfate(SDS),Cadmium(II) reacted quickly with 2-[(5-bromine-2-pyridine)-azo]-5-diethylaminophenol(5-Br-PADAP) and formed a complex,which led to a distinctly enhancement of resonance light scattering signal of system.Accordingly,an analysis method of Cadmium content using resonance light scattering was established.Under optimized conditions,0.40 mL of ammonia-ammonium chloride buffer solution at pH 9.0,0.10 mL of 1.0 mmol/L 5-Br-PADAP solution,proper amount of Cadmium(II) standard solution and 0.40 mL of 1.0 mmol/L SDS were added successively into a colorimetric tube and diluted to 10.0 mL.After reaction at room temperature for 10 min,the resonance light scattering signals were determined at maximum scattering peak of 604 nm in 1 cm quartz cuvette.The results indicated that in the largest scattering peak at 604 nm,the resonance light scattering intensity was directly proportional to the mass concentration of Cadmium(II) in the range of 5.3 μg/L to 200.0 μg/L with a detection limit(3S_d/K) of 0.1 μg/L.
引文
[1]李连平,吴国汉,黄志勇.原子荧光光谱法测定海水及海产品中的微量镉[J].食品工业科技,2008,29(4):290-291,293.
[2]JANJA VIDMAR,PRIMO? OPRKAL,RADMILA MILA?I?,et al.Investigation of the behaviour of zero-valentiron nanoparticles and their interactions with Cd2+ in wastewater by single particle ICP-MS[J].Science of The Total Environment,2018,634:1259-1268.
[3]EMINE BETüL KAFA,MERVE FIRAT,DOTSE SELALI CHORMEY,et al.Sensitive determination of cadmium in lake water,municipal wastewater and onion samples by slotted quartz tube-flame atomic absorption spectrometry after preconcentration with microextraction strategy[J].Measurement,2018,125:219-223.
[4]李燕群.原子吸收光谱法在重金属铅镉分析中的应用进展[J].冶金分析,2008,28(6):33-41.
[5]陈庆绸.单纯形最优化法测定水中镉[J].集美大学学报(自然科学版),1998,3(3):96-99.
[6]陈飒,刘绍璞,罗红群.乙基紫-阴离子表面活性剂体系的共振瑞利散射光谱及其分析应用[J].分析化学,2004,32(1):19-24.
[7]冉纯明,龙冲,吴征真,等.酸性品红共振光散射法测定食品中的锌[J].化学研究与应用,2018,30(1):119-122.
[8]王金鹏,杜芳艳,刘慧瑾.5-Br-PADAP分光光度法测定食品中的微量铅[J].光谱实验室,2012,29(5):2703-2706.
[9]张姝,李琼,唐微微,等.邻菲罗啉共振光散射光谱法测定痕量镉的研究[J].中国测试,2012,38(5):44-46.
[10]吴丽香,张中洋.5-Br-PADAP-OP显色体系分光光度法测定水中镉(Ⅱ)[J].分析仪器,2006(4):36-38.
[11]张文治,任桂玲.5-Br-PADAP与金属离子显色反应最佳pH值的计算[J].齐齐哈尔大学学报,2006,22(5):38-42.
[12]曾铭.巯基棉分离富集-共振光散射法测定环境水样中痕量铅和镉[J].冶金分析,2007,27(11):44-47.
[13]李方,侯旭,张新申.茶叶、银杏叶中铅II、镉II、铜II的测定[J].分析化学,2003,31(3):380.
[2]JANJA VIDMAR,PRIMO? OPRKAL,RADMILA MILA?I?,et al.Investigation of the behaviour of zero-valentiron nanoparticles and their interactions with Cd2+ in wastewater by single particle ICP-MS[J].Science of The Total Environment,2018,634:1259-1268.
[3]EMINE BETüL KAFA,MERVE FIRAT,DOTSE SELALI CHORMEY,et al.Sensitive determination of cadmium in lake water,municipal wastewater and onion samples by slotted quartz tube-flame atomic absorption spectrometry after preconcentration with microextraction strategy[J].Measurement,2018,125:219-223.
[4]李燕群.原子吸收光谱法在重金属铅镉分析中的应用进展[J].冶金分析,2008,28(6):33-41.
[5]陈庆绸.单纯形最优化法测定水中镉[J].集美大学学报(自然科学版),1998,3(3):96-99.
[6]陈飒,刘绍璞,罗红群.乙基紫-阴离子表面活性剂体系的共振瑞利散射光谱及其分析应用[J].分析化学,2004,32(1):19-24.
[7]冉纯明,龙冲,吴征真,等.酸性品红共振光散射法测定食品中的锌[J].化学研究与应用,2018,30(1):119-122.
[8]王金鹏,杜芳艳,刘慧瑾.5-Br-PADAP分光光度法测定食品中的微量铅[J].光谱实验室,2012,29(5):2703-2706.
[9]张姝,李琼,唐微微,等.邻菲罗啉共振光散射光谱法测定痕量镉的研究[J].中国测试,2012,38(5):44-46.
[10]吴丽香,张中洋.5-Br-PADAP-OP显色体系分光光度法测定水中镉(Ⅱ)[J].分析仪器,2006(4):36-38.
[11]张文治,任桂玲.5-Br-PADAP与金属离子显色反应最佳pH值的计算[J].齐齐哈尔大学学报,2006,22(5):38-42.
[12]曾铭.巯基棉分离富集-共振光散射法测定环境水样中痕量铅和镉[J].冶金分析,2007,27(11):44-47.
[13]李方,侯旭,张新申.茶叶、银杏叶中铅II、镉II、铜II的测定[J].分析化学,2003,31(3):380.