少妇人妻无码专区毛片_蝌蚪视频窝在线播放_欧美性色欧美A在线播放_尤物在线精品视频_欧美精品国产一区二区三区_在线观看成人无码中文AV天堂不卡

美國Entech Instruments 
美國ENTECH公司是一家專業VOCs采樣系統生產商。擁有目前全球最先進的最豐富氣體采樣設備生產經驗,尤其是在蘇碼罐的經驗,專利的SiloniteTM技術是被公認為最為先進的硅烷化技術之一。隨著人們對日益惡化環境的關注程度不斷增加,與大家最直接的環境大氣和室內空氣中的VOCs倍受關注。目前眾多的采樣方法中,公認真空蘇碼罐采樣最準確最有效的采樣方式之一。多年來ENTECH一直在這個領域處于領先地位,開發的產品種類之多,應用廣泛,占據全球90%以上的市場。

Solutions for Analyzing Volatiles  in Solids, Liquid and Gases
Volatile chemicals can be analyzed using a variety of techniques from qualitative, non-specific detectors to very reliable and quantitative GC and GCMS methods. In many cases, remote sample collection and laboratory analysis have several advantages over on-site analysis. Simple, rugged samplers allow the collection of gas, liquid or solid samples without the need for power, field calibration or highly experienced technicians. Collecting the sample without modification in the field eliminates the chance of losing important analytes, as can occur with adsorption tubes. Samples can be collected from several locations and then analyzed on the same laboratory instrument. The result is lower overall costs and elimination of inter-instrument bias.

Entech has been perfecting the art and science of quantifying levels of volatile chemicals in gas phase matrices from % levels to well below 1 PPB. A new surface coating called SiloniteTM allows stainless steel sampling containers, transfer lines and connective fittings and valves to be rendered as inert as fused silica, greatly extending the range of compounds that can be collected in the field. With Silonite coated canisters, compounds can be analyzed up to several weeks later with very little change in gas phase concentrations. Turn key solutions are available for field sampling into vacuum tight Silonite coated canisters, laboratory analysis using multi-position autosamplers and cleanup systems that allow the coated canisters to be re-used hundreds of times.

The introduction of Large Volume Static Headspace (LVSH) in 1999 has created a powerful new tool for analyzing volatiles in the headspace above solid and liquid samples. The static nature of the analysis eliminates the aerosols and foaming associated with dynamic headspace analysis, while lowering detection limits 100-500 times below conventional loop-injection headspace inlets. Combined with the inertness of Silonite coating and Entech's 14 years of experience in preconcen-tration technology, LVSH is allowing a more complete analysis of foods, flavors, odors and out-gassing contaminants than ever before.

Entech's Contributions to the Science of Chemical Sampling and Analysis:
 

1990
First whole air multi-position VOC inlet

1992
First 3-stage preconcentrator for polar/non-polar VOC analysis

1993
Turnkey solutions for air analysis

1994
SmartLab 1 systems introduced

1998
Silonite coated minican introduced

1999
Large Volume Static Headspace

2002
New products for semi-volatile sampling and analysis (flavors, fragrances, chemical weapons, mVOC's)

Silonite coated GC injection liners and fittings

USB based SmartLab 2? introduced

2003
First Robotic Autosampler for canisters and Large Volume Headspace

Direct on-column large volume GC injector for gas phase samples