水样

Abstract(#br)A novel and very simple microextraction approach for pre-concentration and direct solid phase spectrophotometric measurement has been developed for the determination of chromogenic analytes. The model analyte to assess this approach was the chromophore malachite green (MG). The analyte was extracted from water samples onto a small rotating disk made of Teflon containing a sorbent phase of polydimethylsiloxane (PDMS) on one of its surfaces. We refer to the extraction procedure as rotating disk sorptive extraction (RDSE).

Abstract(#br)A simple and solvent-free analytical method has been optimized for the determination of hydrocarbons (C 6 –C 20 ) from products of the petroleum industry in aqueous samples. Extraction and analysis were carried out using headspace solid-phase microextraction (HS-SPME) and gas chromatography coupled with flame-ionization detector (GC–FID).

文摘( # br )采用顶空固相微萃取( HS-SPME )和气相色谱-三重四极杆质谱( GC-MS / MS )联用技术，建立了一种灵敏、可重复、价格低廉的同时测定痕量和超痕量水样中汞形态的方法。以自制的低成本聚二甲基硅氧烷( PDMS )纤维代替市售PDMS纤维，用四苯硼酸钠( NaBPh4 )原位衍生，在顶空萃取富集无机汞( Hg2 )、甲基汞( MeHg )和乙基汞( EtHg )衍生物。考察了预孵育和萃取温度、预孵育时间、萃取时间和入口温度等一些重要参数。在优化的条件下，烷基汞和无机汞的检出限( LODs )分别为0.03和6 ng L-1。Hg2在25.0 ~ 200 ng L-1，烷基汞在0.12 ~ 80.0 ng L-1范围内相关系数均大于0.994。3个加标水平的实际水样中分析物的回收率均在76.6 % ~ 114.8 %之间。所有汞物种的重复性良好。在最低质控浓度( LQC )水平下，无机汞的相对标准偏差( RSD )为12.1 %，在较高加标浓度下，RSD小于7.7 %。烷基汞的RSD在3.0 ~ 8.5 %范围内。方法验证表明了该方法的适用性，最终用于地表水和废水样品中汞物种的测定。

Analysis of UV Filters in Water using Stir Bar Sorptive Extraction (SBSE) and GC/MS-MSUV filters;Sunscreen agents;Stir bar sorptive extraction (SBSE);Gas chromatography-tandem mass spectrometry (GC/MS-MS);Water samples;A highly sensitive analytical method based on stir bar sorptive extraction (SBSE) technique and gas chromatography/tandem mass spectrometry (GC/MS-MS) has been developed, allowing the simultaneous multi-analyte determination of seven UV filters in water samples.