Abstract: The development of a novel Teflon-coated optical fiber sensor for chlorinated organic determination and a PVC- coated sensor for pesticide determination is described. Current analytical techniques for these compounds in water are not suited to in-situ or on-site measurements. As a result, straight-forward techniques that feature a short analysis time, sufficient selectivity and adequate sensitivity are in high demand. An infrared fiber optic sensor which operates in the 4 to 16 micrometer wavelength region has been developed for the in-situ monitoring of chlorinated hydrocarbons and pesticides in water. The sensing element consists of a silver halide (AgCl$-x$/Br$-1- x$/) optical fiber, coated with Teflon or poly (vinyl chloride) (PVC) which enriches the analyte in the evanescent wave region of the fiber. Enrichment of the analytes occurs in the minute range and is reversible. Using trichloroethylene (TCE) and alachlor as representative pollutants, evanescent wave spectrometry in the mid-infrared (MIR) region is shown to provide good performance down to single ppm levels. Absorbance data were recorded at 938 cm$+$MIN@1$/ and 1104 cm$+$MIN@1$/ for TCE and alachlor respectively. Furthermore, it is shown that the technique can be applied to multi-analyte samples. !15
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机译：摘要：描述了一种新型的用于有机氯测定的涂有聚四氟乙烯的光纤传感器和一种用于农药测定的涂有PVC的传感器的开发。目前水中这些化合物的分析技术不适用于现场或现场测量。结果，急需具有短分析时间，足够的选择性和足够的灵敏度的简单技术。已经开发了一种在4至16微米波长范围内工作的红外光纤传感器，用于现场监测水中的氯代烃和农药。传感元件由卤化银（AgCl $ -x $ / Br $ -1-x $ /）光纤组成，涂有特氟龙或聚氯乙烯（PVC），可在被测物体的van逝波区域中富集分析物。纤维。分析物的富集发生在微小范围内，并且是可逆的。使用三氯乙烯（TCE）和甲草胺作为代表性污染物，中红外（MIR）区域的van逝波光谱显示在低至单个ppm的水平下仍具有良好的性能。 TCE和甲草胺的吸光度数据分别记录为938 cm $ + MIN @ 1 $ /和1104 cm $ MIN + 1 $ /。此外，表明该技术可以应用于多分析物样品。 ！15
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