Field Determinations of Pentachlorophenol in Water Using UV/Vis Spectroscopy

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doi:10.1071/CH12286

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Affiliated with RACI

Royal Australian
Chemical Institute

Field Determinations of Pentachlorophenol in Water Using UV/Vis Spectroscopy

Nicholas G. Stuckey ^A ^C and Kim Larsen ^B

^A NCEA, Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Qld 4350, Australia.
^B Faculty of Sciences, University of Southern Queensland, Toowoomba, Qld 4350, Australia.
^C Corresponding author. Email: nicholas.stuckey@usq.edu.au

Australian Journal of Chemistry 66(1) 105-112 http://dx.doi.org/10.1071/CH12286
Submitted: 19 April 2012 Accepted: 21 September 2012 Published: 31 October 2012





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Abstract

Pentachlorophenol (PCP) is an organochloride pesticide banned in many countries due to its broad-spectrum toxicity. Current methods for monitoring PCP in environmental water require expensive laboratory equipment, limiting field monitoring. Two field methods for screening the concentration of PCP in environmental water are described herein. The first involves filtering the sample and calculating the indicative concentration from the absorbance at 320 nm. Alternatively, the sample can be acidified with concentrated hydrochloric acid to produce a fine suspension. This cloudy solution can be matched to a photo card for field estimation of concentration, or calculated more accurately from the absorbance at 450 nm. The useable ranges for these methods are 2 ppb to 100 ppm for the un-acidified method and 4 ppm to 1000 ppm for the acidified method. Results indicate that aquatic humic substances and natural turbidity present in environmental water do not compromise the results.

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