Evaluation of Microwave Irradiation for Analysis of Carbonyl Sulfide, Carbon Disulfide, Cyanogen, Ethyl Formate, Methyl Bromide, Sulfuryl Fluoride, Propylene Oxide, and Phosphine in Hay

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• 作者：Yonglin Ren ; Daphne Mahon
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：January 10, 2007
• 年：2007
• 卷：55
• 期：1
• 页码：32 - 37
• 全文大小：202K
• 年卷期：v.55,no.1(January 10, 2007)
• ISSN：1520-5118

文摘

Fumigant residues in hay were "extracted" by microwave irradiation. Hay, in gastight glass flasks,was placed in a domestic microwave oven, and fumigants were released into the headspace bymicrowave irradiation. Power settings for maximum release of fumigants were determined for carbonylsulfide (COS), carbon disulfide (CS₂), cyanogen (C₂N₂), ethyl formate (EF), methyl bromide (CH₃Br),sulfuryl fluoride (SF), propylene oxide (PPO), and phosphine (PH₃). Recoveries of fortified sampleswere >91% for COS, CS₂, CH₃Br, SF, PPO, and PH₃ and >76% for C₂N₂ and EF. Completeness ofextraction was assessed from the amount of fumigant retained by the microwaved hay. This amountwas determined from further microwave irradiation and was always small (<5% of the amount obtainedfrom the initial procedure). Limits of quantification were <0.1 mg/kg for COS, CS₂, C₂N₂, EF, andPH₃ and <0.5 mg/kg for CH₃Br, SF, and PPO. These low limits were essentially due to the absenceof interference from solvents and no necessity to inject large-volume gas samples. The microwavemethod is rapid and solvent-free. However, care is required in selecting the appropriate power setting.The safety implications of heating sealed flasks in microwave ovens should be noted.