水
Application of polydimethylsiloxane rod extraction to the determination of sixteen halogenated flame retardants in water samples
Abstract(#br)An extraction and preconcentration procedure for the determination in water samples of several halogenated flame retardants (FRs), nine brominated diphenyls ethers (BDEs) and seven non-BDE FRs, was developed and validated. The optimised procedure is based on polydimethylsiloxane (PDMS) rods as sorptive extraction material, followed by liquid desorption and gas chromatography coupled to negative chemical ionisation–mass spectrometry (GC–NCI–MS) determination, rendering an efficient and inexpensive method.
Comparison of a disposable sorptive sampler with thermal desorption in a gas chromatographic inlet, or in a dedicated thermal desorber, to conventional stir bar sorptive extraction-thermal desorption for the determination of micropollutants in water
Abstract(#br)The presence of micropollutants in the aquatic environment is a worldwide environmental concern. The diversity of micropollutants and the low concentration levels at which they may occur in the aquatic environment have greatly complicated the analysis and detection of these chemicals. Two sorptive extraction samplers and two thermal desorption methods for the detection of micropollutants in water were compared. A low-cost, disposable, in-house made sorptive extraction sampler was compared to SBSE using a commercial Twister sorptive sampler.
Rotating Disk Sorptive Extraction of Cu-Bisdiethyldithiocarbamate Complex from Water and Its Application to Solid Phase Spectrophotometric Quantification;Notes
This study demonstrates the first use of polydimethylsiloxane (PDMS) immobilized on a rotating disk for the extraction of copper from aqueous matrices and its subsequent direct determination by solid phase UV-Visible spectrophotometry. To accomplish the solid-phase extraction and the direct solvent-free spectrophotometric measurement, sodium diethyldithiocarbamate (NaDDTC) was used as an analytical reagent to form the uncharged chromophore complex Cu(DDTC)2, which absorbs at 432 nm.
NQS掺杂PDMS固体传感器：从水基质到尿液酶学应用
原位分析装置的研制获得了突出的科学兴趣。提出了一种将1，2 -萘醌-4 -磺酸盐( NQS )衍生化试剂嵌入到聚二甲基硅氧烷( PDMS )复合材料中的固体传感膜，用于水中NH4和尿中NH2CONH2的原位分析。对于脲酶催化水解尿素也应用了满意的策略，无论是在溶液中还是玻璃负载的脲酶固定化。采用漫反射测量结合彩色强度( RGB坐标)数字图像处理，在传感膜内部发生比色反应后，对定性和定量分析物检测进行评估。在传感器响应与分析物浓度之间找到了合适的线性关系，并用基于Berthelot反应的麝香草酚PDMS传感器对结果进行了验证。所建议的传感装置具有快速、通用性、可移植性和使用无毒试剂等优点，便于以节能的方式进行原位分析。
NQS掺杂PDMs固体传感器：从水基质到尿液酶法应用。
原位分析装置的研制获得了突出的科学兴趣。提出了一种将1，2 -萘醌-4 -磺酸盐( NQS )衍生化试剂嵌入到聚二甲基硅氧烷( PDMS )复合材料中的固体传感膜，用于水中NH4和尿中NH2CONH2的原位分析。对于脲酶催化水解尿素也应用了满意的策略，无论是在溶液中还是玻璃负载的脲酶固定化。采用漫反射测量结合彩色强度( RGB坐标)数字图像处理，在传感膜内部发生比色反应后，对定性和定量分析物检测进行评估。在传感器响应与分析物浓度之间找到了合适的线性关系，并用基于Berthelot反应的麝香草酚PDMS传感器对结果进行了验证。所建议的传感装置具有快速、通用性、可移植性和使用无毒试剂等优点，便于以节能的方式进行原位分析。