MX 3-chloro-4- dichloromethyl -5-hydroxy-2 5H -furanone

Note that some byproducts included on earlier WHO guideline lists (e.g., chloral and chloral hydrate, formaldehyde, trichloroacetonitrile) are not included as they are now considered to be present in drinking water at concentrations far below those considered to present a health risk. 

3- chloro-4-(dichloromethyl)-2-(5H)-furanone (red-MX), (E)-2-chloro-3-(dichloromethyl)-butenedioic acid (ox-MX), (E)-2-chloro-3-(dichloromethyl)-4-oxobutenoic acid (EMX), 2,3-di chloro-4-oxobutenoic acid (mucochloric acid), 3-chloro- 

4- (bromochloromethyl)-5-hydroxy-2(5H)-furanone (BMX-1), 3-chloro-4-(dibromomethyl)-5-hydroxy-2(5H)-furanone (BMX-2), 3-bromo-4-(dibromomethyl)-5-hydroxy-2(5H)-furanone (BMX-3), (E)-2-chloro-3-(bromochloromethyl)-4-oxobutenoic acid (BEMX-1), (E)-2-chloro-3-(dibromomethyl)-4-oxobutenoic acid (BEMX-2), (E)-2-bromo-3-(dibromomethyl)-4-oxobutenoic acid (BEMX-3). Reproduced from Richardson, Trends Anal. Chem. 22, 666 (2003), copyright (2003) with permission from Elsevier. 

Initially a large variability in the relative response factors of the methyl derivative of MX to that of isotopi-cally labeled benzoic acid was observed as a function of relative concentrations, indicating a nonlinear response of the analyte relative to that of the VIS. This nonlinear behavior was shown (Charles 1992) to not arise from competition between MX and the benzoic acid standard in the derivatization reaction (the methylating agent was in very large excess), but rather from a peculiarity of the SIM 

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Suzuki N, Nakanishi J (1995) Brominated analogues of MX (3-chloro-4-(dichloromethyl)-5-hydroxy-2 (5H)-furanone) in chlorinated drinking water. Chemosphere 30 1557-1564... 

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