Abstract
An LC-MS/ MS method for analysing glyphosate and aminomethylphosphonic acid (AMPA) in cereals was developed. The method is based on extraction with water and detection of the ions from the fragmentation m/z 170 --> 88 (glyphosate) and m/z 112 --> 30 (AMPA), using electrospray interface in the positive mode. Investigation from the harvests of 1998 and 1999 showed residues of glyphosate and/or its degradation product AMPA in more than half of the cereal samples produced in Denmark. The average concentration of glyphosate in 46 samples from the 1999 harvest was 0.11 mg/kg compared with 0.08 mg/kg for the 1998 harvest (n=49). Thus, the figures were well below the maximum residue limit (MRL) and no violations were observed. The plant growth regulators chlormequat and/or mepiquat were investigated in cereals from the Danish harvest of 1999 where 83% of the samples contained chlormequat (n=46) compared with 87% of the samples from the 1997 harvest (n=52). The average concentration of chlormequat in 1999 was 0.32 mg/kg compared with 0.23 mg/kg in 1997. At 2.9 mg/kg, one sample of wheat bran was exceeding the MRL of 2 mg/kg for wheat. The intakes of the pesticides through the diet of cereals were estimated to comprise 0.04% of the acceptable daily intake (ADI) for glyphosate and 1% of the ADI for chlormequat for an adult Dane.
Original language | English |
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Journal | Food Additives and Contaminants |
Volume | 18 |
Issue number | 10 |
Pages (from-to) | 898-905 |
ISSN | 0265-203X |
Publication status | Published - 2001 |
Event | 3rd European Pesticide Residues Workshop - York, United Kingdom Duration: 3 Jul 2000 → 5 Jul 2000 |
Workshop
Workshop | 3rd European Pesticide Residues Workshop |
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Country/Territory | United Kingdom |
City | York |
Period | 03/07/2000 → 05/07/2000 |