Field Determination of Leachable Arsenic in Soil by Ultrasonic Extraction-Molybdenum Blue Colorimetry

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  • KAWAKUBO Susumu
    Department of Materials Design Chemistry, Interdisciplinary Graduate School of Medical and Engineering Science, University of Yamanashi
  • SASAKI Kazunori
    Department of Materials Design Chemistry, Interdisciplinary Graduate School of Medical and Engineering Science, University of Yamanashi
  • MARUTA Toshihisa
    Research and Development Center, Taiheiyo Consultant Co., Ltd.
  • SUZUKI Yasutada
    Department of Materials Design Chemistry, Interdisciplinary Graduate School of Medical and Engineering Science, University of Yamanashi
  • KOMUKAI Yuto
    Research and Development Center, Taiheiyo Consultant Co., Ltd.

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Other Title
  • 超音波抽出-モリブデン青比色法による土壌中の溶出性ヒ素の現場定量
  • チョウオンパ チュウシュツ モリブデンアオ ヒショクホウ ニ ヨル ドジョウチュウ ノ ヨウシュツセイ ヒソ ノ ゲンバ テイリョウ

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Abstract

A field determination method was developed for water-leachable arsenic in soil by ultrasonic extraction and Molybdenum Blue colorimetry. The extraction of arsenic from 2.0 g of soil sample with 20 ml of water was performed by ultrasonication (46 kHz, 18 W) for 30 min. The extraction was repeatable within a relative standard deviation of 10%. The water-leachable concentrations of arsenic were comparable to those obtained by the shaking extraction (6 h) used in Notification 46 of Environmental Agency of Japan. Absorbance of molybdenum blue was measured at 630 nm with a band width of 25 nm by a laboratory-made portable colorimeter with an RGB light-emitting diode. Detection limits with and without the enrichment by MIBK extraction was 0.006 mg/l and 0.012 mg/l, respectively. The proposed method was applicable for soil samples containing 0.01 to 25 mg/l of arsenic.

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