引用本文:王晓雯,王炜.两种前处理方法对液相色谱-电感耦合等离子体质谱法测定土壤中有机汞的比对研究[J].环境监控与预警,2023,15(3):63-67
WANG Xiaowen,WANG Wei.Comparison of Two Pretreatment Methods for the Determination of Organic Mercury in Soil by HPLC-ICP-MS[J].Environmental Monitoring and Forewarning,2023,15(3):63-67
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两种前处理方法对液相色谱-电感耦合等离子体质谱法测定土壤中有机汞的比对研究
王晓雯,王炜1,2
1.辽宁省大连生态环境监测中心,辽宁 大连 116023;2大连市生态环境事务服务中心,辽宁 大连116023
摘要:
分别采用酸浸提法和碱消解法作为前处理方法,以液相色谱-电感耦合等离子体质谱法(HPLC-ICP-MS)作为测定方法测定土壤中的有机汞(甲基汞、乙基汞和苯基汞),对2种前处理方法进行比对分析。结果表明,采用酸浸提法,3种有机汞的方法检出限为0.5~0.9μg/kg,甲基汞和乙基汞的加标回收率为72.4%~86.4%,相对标准偏差(RSD)均<9.3%,苯基汞的回收率均<40%,RSD为7.4%~10.2%;采用碱消解法,3种有机汞的方法检出限为0.3~0.4μg/kg,加标回收率为60.4%~106%,RSD均<8.6%。碱消解法相较于酸浸提法,具有更高的萃取效率,更好的回收率和重复性。
关键词:  液相色谱-电感耦合等离子体质谱法  土壤  甲基汞  乙基汞  苯基汞  酸浸提法  碱消解法
DOI:
分类号:X833
基金项目:国家重大科学仪器设备开发专项课题(2011YQ060100)
Comparison of Two Pretreatment Methods for the Determination of Organic Mercury in Soil by HPLC-ICP-MS
WANG Xiaowen,WANG Wei1,2
1. Dalian Ecological Environment Monitoring Center of Liaoning Province, Dalian, Liaoning 116023, China;2. Dalian Ecological Environment Affairs Service Center, Dalian,Liaoning 116023, China
Abstract:
Acid leaching and alkali digestion were used as pretreatment methods, and high performance liquid chromatograph inductively coupled plasma mass spectrometry (HPLC-ICP-MS) was used for determination of organic mercury (methyl mercury, ethyl mercury and phenyl mercury) in soil. The two pretreatment methods were compared and analyzed. The results showed that the detection limits of methyl mercury, ethyl mercury and phenyl mercury by acid leaching were from 0.5 to 0.9μg/kg, the recoveries of methyl mercury and ethyl mercury ranged from 72.4% to 86.4%, the relative standard deviations were all less than 9.3%. The recoveries of phenyl mercury were below 40%, the relative standard deviations ranged from 7.4% to 10.2%. The detection limits of three kinds of organic mercury by alkali digestion were from 0.3 to 0.4μg/kg, the recoveries ranged from 60.4% to 106%, the relative standard deviations were all less than 8.6%. Compared with acid leaching, alkali digestion shows higher extraction efficiency, better recovery and repeatability.
Key words:  HPLC-ICP-MS  Soil  Methyl mercury( MeHg)  Ethyl mercury( EtHg)  Phenyl mercury( PhHg)  Acid leaching  Alkali digestion