海水和大气中挥发性硫化物分析方法的研究

发布时间：2018-04-11 23:26

本文选题：挥发性硫化物 + 羰基硫　；参考：《分析化学》2017年10期

【摘要】：建立了大气和海水中挥发性硫化物的气相色谱分析方法,确定了最佳实验条件。为了适应不同的基质和保存方式,大气和海水样品采用了不同的分析方法。测定大气样品时,采用大气采样罐及三级冷阱预浓缩气相色谱-质谱联用技术,而海水样品采用吹扫捕集-气相色谱测定。本方法测定大气挥发性硫化物的线性范围较好,精密度为7.7%~15.1%,检出限为0.23~4.7 ng;海水中挥发性硫化物的精密度为3.5%~5.3%,检出限为2.5~3.5 ng。将本方法用于青岛近海海水和大气中硫化物的测定,测得海水中羰基硫、二甲基硫和二硫化碳的平均浓度分别为(268±58)pmol/L、(1264±0.2)pmol/L、(19±2)pmol/L,大气中的平均浓度为543±39、39±9和56±20(×10~(-12),V/V)。本方法可准确测定海洋环境中的挥发性硫化物。
[Abstract]:A gas chromatographic method for the determination of volatile sulfides in air and sea water was established and the optimum experimental conditions were determined.In order to adapt to different substrates and preservation methods, different analytical methods were used for atmospheric and seawater samples.The gas chromatography-mass spectrometry (GC-MS) technique was used for the determination of atmospheric samples in a gas sampling tank and a three-stage cold trap preconcentration, while that for seawater samples was determined by purging and trapping gas chromatography-gas chromatography.The linear range of this method for the determination of volatile sulfides in the atmosphere is better, the precision is 7.7ng and the detection limit is 0.234.7ng. the precision of volatile sulfides in seawater is 3.5and 5.3ng.The detection limit is 2.50.5ng.The method can accurately determine volatile sulfides in marine environment.
【作者单位】：中国海洋大学化学化工学院;海洋国家实验室海洋生态与环境科学功能实验室;
【基金】：国家重点研发计划项目(No.2016YFA0601301) 国家自然科学基金项目(Nos.41576073,41320104008) 青岛海洋科学与技术国家实验室"鳌山人才"建设工程经费资助~~
【分类号】：O657.63;X502

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