天天舔天天爽_视频日韩_成人网线_天天草草草_免费一级在线观看_色综合色综合色综合色综合

美國(guó)Entech Instruments 
美國(guó)ENTECH公司是一家專業(yè)VOCs采樣系統(tǒng)生產(chǎn)商。擁有目前全球最先進(jìn)的最豐富氣體采樣設(shè)備生產(chǎn)經(jīng)驗(yàn),尤其是在蘇碼罐的經(jīng)驗(yàn),專利的SiloniteTM技術(shù)是被公認(rèn)為最為先進(jìn)的硅烷化技術(shù)之一。隨著人們對(duì)日益惡化環(huán)境的關(guān)注程度不斷增加,與大家最直接的環(huán)境大氣和室內(nèi)空氣中的VOCs倍受關(guān)注。目前眾多的采樣方法中,公認(rèn)真空蘇碼罐采樣最準(zhǔn)確最有效的采樣方式之一。多年來ENTECH一直在這個(gè)領(lǐng)域處于領(lǐng)先地位,開發(fā)的產(chǎn)品種類之多,應(yīng)用廣泛,占據(jù)全球90%以上的市場(chǎng)。

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