微波消解-ICP-AES法测定坛紫菜中重金属及近年坛紫菜金属污染调查

Determination of Porphyra haitanensis by Microwave Digestion-ICP-AES Method and Investigation Their Contaminations

摘要:

以东海海域某养殖场中坛紫菜为原料，采用微波消解法-ICP-AES标准曲线法对坛紫菜中铝（Al）、锌（Zn）、铜（Cu）、镉（Cd）、砷（As）、铬（Cr）和铅（Pb）7种金属元素含量进行测定。各金属元素加标回收率为95.63%～105.3%，说明微波消解-等离子电感耦合等离子体原子发射光谱法（ICP-AES）能够实现对坛紫菜重金属元素的快速精确检测。另外，监测了近5年来坛紫菜的金属污染情况，结果发现呈显著上升趋势（P<0.05，RSD<1.89%），并且2012年不同嫩度的紫菜中金属含量呈现一水＞二水＞三水＞四水的现象（P<0.05，RSD<1.89%），应引起重视和治理。

Abstract:

A microwave digestion coupled plasma atomic emission spectroscopy(ICP-AES) method was presented for the determinations of Al, Zn, Cu, Cd, As, Cr and Pb in Porphyra haitanensis, and the samples were collected from a from in east china sea. The recovery rates of metals were between 97.8% and 104.9%, and actual applications demonstrate that this method is sensitive to achieve the determinations of metal content in Porphyra haitanensis. The results showed that an significant increasing trends were found in the metal contamination of Porphyra haitanensis during the past five years(P<0.05, RSD<1.89%), and different tenderness of the Porphyra haitanensis collected in 2012 showed an increasing contaiminations in the first＞the second＞the third＞the fourth cultivation duration.