Atrazine adduct formation

Example 5.4 Adduct formation between methacrylic acid (MAA) and atrazine. 

Atrazine and two major degradation products, desethylatrazine and desisopropylatrazine have been analysed by using acetonitrile-water (50 50) and 0.05 M ammonium acetate. As regards to the chloroatrazines, it should be commented that in PI mode TSP LC-MS a common feature in the adduct ion formation has been observed, with the formation of [M + H + CHjCN] as base peak with the exception... 

In the oase of ohlorotnazines differences in the base peak when using the two ionizing additives are also noticeable, with the formation of [M + H]+ or [M + 60]+- as base peaks when either ammonium formate or ammonium acetate are used. In the NI mode, the chlorinated phenoxyacids exhibited [M + HCOO] as base peak instead of the typical acetate adduct when ammonium formate was used instead of ammonium acetate (7). As examples, in table I the different adducts obtained in each ionizing additive for atrazine, 2,4-D and diuron are shown. 

The typical mole ratio of atrazine, methacrylic acid, and ethylene glycol dimethacrylate in chloroform is 1 3-5 25-30. Although the adduct is formed from one atrazine and two methacrylic acids (Fig. 6.2), the atrazine/methacrylic acid ratio in the mixtures is usually kept around 4 to move the equilibrium toward the formation of these hydrogen-bonding adducts. The mole ratio of crosslinking agent to the template is in general 20-30. 

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