固相微萃取纤维组件 57318
固相微萃取纤维组件SPME fiber assemblies can be reused for up to 100 analyses, or more, depending on the application and the care they are given. For reuse, simply condition with heat before and after every analysis. Solvent can be used for HPLC applications or when heat does not sufficiently clean the fiber. Each assembly has a color-coded or notched hub indicating the type of coating on the fiber. Choose the assembly that is appropriate for the holder: manual or autosampler/HPLC. First time SPME users must order both a holder and a fiber assembly. The key to proper SPME performance is fiber selection, below are some guidelines for choosing the proper fiber.Coating type and thicknessAs a first step, identify the type and molecular weight range of the analytes to be extracted. Higher molecular weight compounds desorb easier from the 7μm or 30μm PDMS absorption fiber coatings compared to the 100μm PDMS or adsorbent fibers (see Table A). Smaller molecules are retained in the pores of the fibers containing adsorbents in the coating e.g. Carboxen, divinylbenzene particles. Further, refine your choice by matching the fiber coating relative to analyte polarity.Needle gaugeThe SPME fiber is protected by the needle during insertion through the septum and when not exposed for sampling. The original SPME fibers were manufactured with 24 gauge needles, and these continue to work very well for manual sampling. More recently we have developed SPME fibers with 23 gauge needles and highly recommend the 23 gauge be used for all applications utilizing an autosampler. The 23 gauge needles also work well with the Merlin Microseal septum system, as well as other septum-less seals. Try to avoid using the 23 gauge needles with standard silicone septa, as they may core the septum.Fiber core materialSPME fibers were first coatedon a fused silica core. More recently the StableFlex SPME fibers have been improved by applying the coating on a flexible fused silica core. The coating partially bonds to the flexible core which results in a more stable coating and a less breakable fiber. The extraction selectivity of StableFlex fibers however may be slightly different from the same coating on a standard fused silica core.订货信息:固相微萃取纤维组件涂层适用于针头颜色材质货号包装碳分子筛/聚二甲基硅氧烷(CAR/PDMS)固相微萃取萃取头75 μmmanual holder24gablack plainfused silica573183ea75 μmmanual holder23gablack plainfused silica57344-U3ea75 μmautosampler24gablack plainfused silica573193ea75 μmautosampler23gablack plainfused silica57343-U3ea85 μmmanual holder24galight blue plainStableFlex57334-U3ea85 μmautosampler24galight blue plainStableFlex57335-U3ea85 μmautosampler23galight blue plainStableFlex57295-U3ea聚二甲基硅氧烷 (PDMS)固相微萃取萃取头100μmmanual holder24gared plainfused silica57300-U3ea30 μmmanual holder24gayellow plainfused silica573083ea100μmautosampler24gared plainfused silica573013ea30 μmautosampler24gayellow plainfused silica573093ea7 μmautosampler24gagreen plainfused silica573033ea100μmautosampler23gared plainfused silica57341-U3ea7 μmmanual holder24gagreen plainfused silica573023ea100μmmanual holder23gared plainfused silica57342-U3ea7 μmautosampler23gagreen plainfused silica57291-U3ea30 μmautosampler23gayellow plainfused silica57289-U3ea聚二甲基硅氧烷/二乙烯基苯 (PDMS/DVB) 固相微萃取萃取头65 μmmanual holder24gablue plainfused silica57310-U3ea65 μmmanual holder23gablue plainfused silica57346-U3ea65 μmautosampler24gablue plainfused silica573113ea60 μmautosampler/HPLC24gabrown notchedStableFlex573173ea65 μmautosampler23gablue plainfused silica57345-U3ea65 μmmanual holder24gapink plainStableFlex57326-U3ea65 μmautosampler24gapink plainStableFlex57327-U3ea65 μmautosampler23gapink plainStableFlex57293-U3ea聚丙烯酸酯(PA)固相微萃取萃取头85 μmmanual holder24gawhite plainfused silica573043ea85 μmautosampler24gawhite plainfused silica573053ea85 μmautosampler23gawhite plainfused silica57294-U3ea二乙烯基苯/碳分子筛/聚二甲基硅氧烷 (DVB/CAR/PDMS) 固相微萃取萃取头50/30μmmanual holder24gagray plainStableFlex57328-U3ea50/30μmautosampler24gagray plainStableFlex57329-U3ea50/30μmmanual holder/autosampler24gagray notchedStableFlex (2cm)57348-U3ea50/30μmautosampler23gagray plainStableFlex57298-U3ea50/30μmmanual holder/autosampler23gagray notchedStableFlex57299-U3eaCarbowax-聚乙二醇 (PEG) 固相微萃取萃取头60 μmautosampler23gapurple plainmetal alloy57354-U3ea60 μmmanual holder23gapurple plainmetal alloy57355-U3ea