A Low Temperature Ashing Pretreatment Method for the Analysis of Heavy Metals in Foods

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  • 低温灰化法による食品中の重金属分析法に関する研究
  • Low Temperature Ashing Pretreatment Met

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A low temperature ashing (LTA) pretreatment method was developed for the analysis of heavy metals in foods, and the results were compared with those obtained by the conventional wet and dry ashing methods.<br>1) The LTA method requires few reagents, and utilizes oxygen plasma. Ashing can thus be done easily and simply, with little risk of contamination of samples by metals.<br>2) Before LTA, treatments may be necessary to remove moisture from samples and to prevent losses from samples with high contents of oils.<br>3) There was no significant loss of metals in the LTA method except in the case of arsenic. The recoveries of added cadmium, zinc, manganese, lead, chromium, nickel and copper were nearly 100%.<br>4) Loss of arsenic could be avoided in LTA by using a radio frequency power (R. F. power) of less than 100W.<br>5) Analysis of standard samples made available by the joint FAO/WHO investigation group showed that the present method gives accurate results.

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