环境水中总挥发性有机硫化物的检测方法

建立了一种捕集、解析、氧化、紫外荧光检测技术,用于水中痕量总挥发性有机硫化物的检测.自行研制的低温捕集－热解析装置实现水中痕量挥发性有机硫化物的富集,富集的有机硫化物在高温和助燃气作用下,充分氧化为二氧化硫,采用紫外荧光法检测二氧化硫含量,从而间接获得水中总挥发性有机硫化物的浓度值.方法的捕集温度5℃,解析温度150℃,氧化温度1000℃,气提室温度65℃,气提时间20min,精密度5.5%,检测限为6ng/L,加标回收率为91.6%~95.1%.利用该装置对青岛市某池塘水样进行检测分析,检测结果中总挥发性有机硫化物的含量为1503~1911ng/L.

Research on determination of total volatile organic sulfur compounds in water

A detection technology was established comprising trap,desorption,oxidation and UV fluorescence determination process and used for the test of total concentration of trace volatile sulfur compounds(VSCs) in water.A cryogenic trap-thermal desorption device was developed,which was applied to capture and enrich trace volatile organic sulfur compounds.Under high temperature and combustion-supporting gas,the VSCs were completely oxidized into sulfur dioxide.Analyzing the content of sulfur dioxide through ultraviolet fluorescence method indirectly help to gain the total concentration of volatile organic sulfur compounds.The trapping temperature,gas stripping room temperature,desorption temperature,oxidation temperature were 5℃,65℃,150℃ and 1000℃ and the purge time was 20min,respectively.The detection limit was as low as 6ng/L,precision was 5.5% and recovery of the method was 91.6～95.1%.This content of trace amounts of VSCs determined from pond water at Qingdao was 1503～1911ng/L.