快速提取法测定水中痕量铅  

Determination of Trace Lead in Water by Rapid Extraction Method

作　　者：袁姚 邓金花 秦惠 林昆仑 李俊恒 Yuan Yao;Deng Jinhua;Qin Hui;Lin Kunlun;Li Junheng(Guangdong Huankai Biotechnology Co.,Ltd.,Shaoguan 512029;Guangdong Institute of Microbiology,Guangzhou 510070,China)

机构地区：[1]广东环凯生物技术有限公司,广东韶关512029 [2]广东省科学院微生物研究所,广东广州510070

出　　处：《广东化工》2023年第11期208-210,共3页Guangdong Chemical Industry

摘　　要：利用18-冠醚-6与脱脂棉选择性分离和提取水中的痕量铅,经稀硝酸洗脱后,与meso-四(N-甲基-4-吡啶基)卟啉[T(4-MPy)P]快速反应,在波长476 nm处测定溶液的吸光度值,根据标准曲线计算铅含量。在最佳实验条件下,该方法在0~200μg/L的范围内,Pb^(2+)的质量浓度与吸光度值成线性关系,相关系数为0.9993,相对标准偏差为1.7%(50μg/L Pb^(2+),n=5)。该方法用于自来水、河涌水等实际水样分析时,加标回收率在95%~100%之间。该方法简便,选择性强,测定体系抗干扰的效果好,灵敏度高。Trace lead in water was selectively separated and extracted with 18-crown-6 and absorbent cotton.After elution with dilute nitric acid,lead ion reacted with meso-tetra(N-methyl-4-pyridyl)porphyrin[T(4-MPy)P]quickly.The absorption value of the solution was determined at 476 nm,and the lead content was calculated according to the standard curve.Under the best experimental conditions,in the range of 0~200μg/L,the mass concentration of Pb^(2+)had a good linear relationship with the absorbance value,and the correlation coefficient was 0.9993,and also the relative standard deviation was 1.7%(50μg/L Pb^(2+),n=5).When the method was applied to the analysis of tap water,river water and other environmental water samples,the percent recovery was between 95% and 100%.The method is simple,selective,and has good anti-interference effect and high sensitivity.

关 键 词：18-冠醚-6 脱脂棉 快速提取 T(4-MPy)P 痕量铅 

分 类 号：O657.32[理学—分析化学]