Determination of Inorganic Arsenic for Pet Food by LC-ICP-MS

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  • Suzuki Chika
    Sendai Regional Center, Food and Agricultural Materials Inspection Center
  • Nomura Masayo
    Fertilizer and Feed Inspection Department, Food and Agricultural Materials Inspection Center
  • Okutomi Yuki
    Fukuoka Regional Center, Food and Agricultural Materials Inspection Center

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Other Title
  • 愛玩動物用飼料中の無機ヒ素の液体クロマトグラフ–誘導結合プラズマ質量分析計による定量法
  • アイガン ドウブツヨウ シリョウ チュウ ノ ムキ ヒソ ノ エキタイ クロマトグラフ-ユウドウ ケツゴウ プラズマ シツリョウ ブンセキケイ ニ ヨル テイリョウホウ

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<p>We have developed a quantitative determination method of the concentration of inorganic arsenic in pet foods using a liquid chromatograph-inductively coupled plasma-mass spectrometer (LC-ICP-MS). After adding 2 w/v% TMAH solution to a sample, inorganic arsenic was extracted by heating and the extract was collected by water. The pH of the solution was adjusted, and injected into a LC-ICP-MS to determine the concentration of inorganic arsenic. LC separation was carried out on an ODS column with 10 mmol/L sodium 1-butanesulfonate, 4 mmol/L malonic acid, 4 mmol/L TMAH and 0.05% methanol solution as a mobile phase. A collaborative study was conducted by nine laboratories using dry and wet-type pet foods, formed jerky, dried jerky and biscuit. Dry-type pet food and dried jerky was added with 2 mg/kg of As (III). Wet-type pet food was added with 0.5 mg/kg of As (III). Formed jerky was added with 1 mg/kg of As (III). Biscuit was added with 0.2 mg/kg of As (III). The mean recoveries, repeatabilities and reproducibilities in the form of relative standard deviation (RSDr and RSDR), and HorRat, were 95.4% to 98.3%, less than 2.9%, less than 9.1%, and 0.22 to 0.51, respectively.</p>

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