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手携快速分析近红外光谱仪-石油污染土壤

手携快速分析近红外光谱仪-石油污染土壤


石油中的苯系物BTEX(苯、甲苯、乙苯、二甲苯)和多环芳烃具有致癌、致变、致畸作用,并可通过食物链逐级富集影响到人类;石油污染物中不易被土壤吸附的部分还能渗入地下污染地下水。石油类污染物对土壤和水环境的污染已成为当前和今后突出的环境问题之一,引起人们高度重视。而土壤和地下水有机污染又具有复杂性、隐蔽性和污染治理难度大、费用高、时间长等特点。


因此市场需要一个快速的手携红外光谱仪, 现介绍国外使用的Zeiss Corona 45 VISNIR光谱的类同


Zeiss Corona 45 VISNIR 手携式380-1760nm光谱仪, 直接对被污染土壤现场快速测量,  相同样办分别以CORONA及实验室色谱仪作光谱及化学分析, 经化统建模及定标后, 只需携带Corona 到现场测量当中的有毒物质toluene, ethylbenezene, xylene。

 

这样快速及无接触的测量, 可不用依赖实验室中传统色谱仪分析的成本, 包括配材及制样办成本。

 


Keywords:petroleum hydrocarbon,
near-infrared spectroscopy, 污染, 土壤, 土壤现场快速测量

 

Analysis of total petroleum hydrocarbon and fractions in soil by field-portable near infrared spectroscopy

 

Diane Malley and Peter Warburton

PDK Projects, Inc., Nanaimo, B.C., and Winnipeg, MB

 


The widespread use of petroleum hydrocarbons (PHCs) as fuels for transportation, heating and as lubricants has led to numerous accidental spills, leakage, or operational losses into the environment. Associated soil and water contamination poses health hazards to humans and animals.
The use of near-infrared spectroscopy for the rapid analysis of petroleum hydrocarbons in contaminated soil is briefly reviewed. Using a field-portable spectrophotometer, the Zeiss Corona 45 VISNIR spectrometer, 70 bulk PHC-contaminated soil samples from three remote communities in Manitoba were scanned from 380 to 1760 nm. PHC fractions were determined chemically using gas chromatography by standard methods defined by the Canadian Council of Ministers of the Environment (CCME) for three fractions representing varying straight chain hydrocarbon length. Fraction 1 is 5 to10 carbons; fraction 2, 10 to 16; and fraction 3, 16 to 34. As well, BTEX, i.e., benzene, toluene, ethylbenzene and xylene, were determined. Calibrations were developed between the spectral data and the chemical data for toluene, ethylbenezene, xylene, and the three PHC fractions separately for coarse (>75 um) and fine grain size (< 75 um) samples. Results for coarse soils were successful to very successful for each constituent whereas results from fine samples were uniformly less good, and some were not useful. This difference may by explained if coarse soils allow for a more even distribution of PHC in the matrix and therefore more representative sampling and NIRS analysis. Movement of PHC through fine soils may be more through cracks and slickensides, resulting in less repeatable subsampling and NIRS analysis.

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