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1982年秋至1983年夏在唐山地区引滦施工单位进行营养调查时,收集了当时食物样品,混合餐样及头发进行了分析。头发和混合餐样中微量元素含量已另文发表,本文仅报告40余种食物的锌含量。 方法 锌的测定采用F-78型极谱仪,以银基汞膜电极作工作电极的三电极系统阳极溶出伏安法。称取200mg样品放入烧杯内,在140～160℃下消化后稀释到一定浓度,在10ml NH_3(0.6M)-NH_4Ac(0.1M)辅助电解质中插入三电极系统,接通极谱仪后,在通N_2的同时
In the autumn of 1982 to the summer of 1983, when conducting the nutrition survey in the construction unit of the Luanhe River in Tangshan, the food samples, the mixed meal samples and the hair were collected for analysis. The content of trace elements in hair and mixed meals has been published in another article. This article reports only the zinc content of more than 40 foods. Methods The determination of zinc was carried out by anodic stripping voltammetry using a F-78 polarographic instrument with silver-based mercury membrane electrode as the working electrode. Weigh 200mg sample into the beaker, after digestion at 140 ~ 160 ℃ diluted to a certain concentration, 10ml NH_3 (0.6M) -NH_4Ac (0.1M) auxiliary electrolyte inserted three-electrode system, connected to the polarography, At the same time pass N_2