Direct DOC and nitrate determination in water using dual pathlength and second derivative UV spectrophotometry

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• 作者：Jean Causse^a ; ^b ; Olivier Thomas^a ; ^b ; Aude-Valé ; rie Jung^a ; ^b ; ^c ; Marie-Florence Thomas^a ; ^{marie-florence.thomas@ehesp.fr}
• 关键词：UV spectrophotometry ; Second derivative ; Nitrate ; DOC ; Freshwaters ; Dual optical pathlength
• 刊名：Water Research
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：108
• 期：Complete
• 页码：312-319
• 全文大小：860 K
• 卷排序：108

文摘

A new methodology for the simultaneous determination of DOC and nitrate in water using dual pathlength and second derivative UV is proposed. A dual pathlength is proposed to allow the simulateous determination of DOC and NO3. The measurement can be carried out on raw samples, without prefiltration. Second derivative absorbance (SDA) at 226 nm is used for nitrate determination. SDA at 295 nm is used for DOC determination after nitrate correction. The method was tested on several hundred of freshwater samples.