电热板消解-原子吸收测定海洋生物体中重金属的方法研究

Study on the Method of Digestion Using Electric Heating Plate and Atomic Absorption Spectrometry for Determining Heavy Metals in Marine Organisms

摘要

本文把双壳贝类作为分析对象，用电热板消解技术作为海洋生物体中Cu，Pb，Zn，Cd，Cr分析的前处理方法[1]，使用原子吸收分光光度计测定样品消解液，取样量为0.5000g加入10.0mLHNO₃和5.0mLH₂O₂,消解温度140℃，加盖消解1小时的条件下，测定样品的加标回收率在90%-110%范围内，消解效果很好。并通过优化前处理赶酸环节的条件[2]，对消解效果进行比较。

Abstract

This paper takes bivalve mollusks as the analytical subject, employing electric hot plate digestion technology as the pretreatment method for the analysis of Cu, Pb, Zn, Cd, and Cr in marine organisms. The sample digestion solution is determined using an atomic absorption spectrophotometer. With a sample weight of 0.5000g, 10.0mL of HNO₃ and 5.0mL of H₂O₂ are added, and digestion is carried out at 140℃ with a lid on for 1 hour. The recovery rate of the spiked samples is measured to be within the range of 90%-110%, indicating excellent digestion efficiency. By optimizing the conditions of the acid removal step in the pretreatment, the digestion efficiency is compared.

关键词

电热板消解 / 原子吸收 / 重金属

Key words

digestion on electric heating plate / atomic absorption / heavy metals

参考文献

[1] GB 17378.6—2007,《海洋监测规范 第6部分：生物体分析》[S]. 北京： 中国标准出版社． 2007

[2] HJ 832—2017,《土壤和沉积物 金属元素总量的消解 微波消解法》[S]. 北京： 中国环境出版社． 2017

[3] GB 17378.2—2007,《海洋监测规范 第2部分：数据处理与分析质量控制》[S]. 北京： 中国标准出版社. 2007