本準(zhǔn)規(guī)定了測定水中烷基汞（甲基汞，乙基汞）的氣相色譜法。 本標(biāo)準(zhǔn)適用于地面水及污水中烷基汞的測定。 本方法用琉基棉富集水中的烷基汞，用鹽酸氯化鈉溶液解析，然后用甲苯萃取，用帶電子捕獲檢測器的氣相色譜儀測定，實(shí)際達(dá)到的最低檢出濃度隨儀器靈敏度和水樣基體效應(yīng)而變化，當(dāng)水樣取1L時，甲基汞通常檢測到10ng/L，乙基汞檢測到20ng/L。 樣品中含硫有機(jī)物（硫醇，硫醚，噻酚等）均可被富集萃取，在分析過程中積存在色譜柱內(nèi)，使色譜柱分離效率下降，干擾烷基汞的測定。定期往色譜柱內(nèi)注入二氯化汞苯飽和溶液，可以去除這些干擾，恢復(fù)色譜柱分離效率。
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浩瀚色譜采用巰基棉富集水質(zhì)中的烷基汞,再用2.0 mol/L的氯化鈉和1.0 mol/L的鹽酸混合溶液進(jìn)行解析,然后用1.0 mL甲苯萃取,最后用帶有電子捕獲檢測器的氣相色譜儀測定水質(zhì)中的烷基汞對實(shí)際水樣進(jìn)行平行實(shí)驗(yàn)的平均相對偏差為0.85%,本方法的準(zhǔn)確度和精密度良好,能滿足一般水質(zhì)的環(huán)境監(jiān)測要求。
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名稱：島津硬質(zhì)玻璃填充柱
規(guī)格：2.1m*3mm*5mm
型號：5%DEGS/Chromosorb W AW DMCS,80-100目
*高使用溫度：200°C
編號：20240721001
應(yīng)用：島津GC-14C，GC-2010，GC-2018，GC-2014，GC-2030
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This standard specifies the gas chromatography method for determining alkylmercury (methylmercury, ethylmercury) in water. This standard is applicable for the determination of alkylmercury in surface water and wastewater. This method uses sulfur cotton to enrich alkylmercury in water, analyzes it with hydrochloric acid and sodium chloride solution, extracts it with toluene, and determines it with a gas chromatograph with an electron capture detector. The actual minimum detectable concentration varies with instrument sensitivity and water sample matrix effect. When taking 1L of water sample, methylmercury is usually detected at 10ng/L, and ethylmercury is detected at 20ng/L. The sulfur-containing organic compounds (thiols, thioethers, thiophenols, etc.) in the sample can be enriched and extracted, and accumulate in the chromatographic column during the analysis process, which reduces the separation efficiency of the chromatographic column and interferes with the determination of alkylmercury. Regularly injecting a saturated solution of mercuric chloride and benzene into the chromatographic column can remove these interferences and restore the separation efficiency of the column.
Haohan chromatography uses thiol cotton to enrich alkylmercury in water quality, and then analyzes it with a mixed solution of 2.0 mol/L sodium chloride and 1.0 mol/L hydrochloric acid. It is then extracted with 1.0 mL toluene and finally measured for alkylmercury in water quality using a gas chromatograph with an electron capture detector. The average relative deviation of parallel experiments on actual water samples is 0.85%. This method has good accuracy and precision, and can meet the environmental monitoring requirements of general water quality.
Name: Shimadzu Hard Glass Filled Column
Specification: 2.1m * 3mm * 5mm
Model: 5% DEGS/Chromosorb W AW DMCS, 80-100 mesh
*High operating temperature: 200 ° C
Number: 20240721001
Application: Shimadzu GC-14C, GC-2010，GC-2018，GC-2014，GC-2030
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