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but the LC water/methanol gradient technique did not separate the parent compound from the major metabolic product, hydroxy-naphthalene. Both compounds were, however, readily identified in the mass spectra corresponding to a single LC peak. Furthermore, an LC/MS combination obviates the need for the high purity, optically transparent solvents used with UV-detection systems. The use of the membrane device, however, limits the solvents to readily volatile, polar compounds.An LC/MS interface can be, therefore, of great utility for the identification of compounds in the LC effluent, even though the physical requirements of the MS limit the general applicability. Important considerations in the selection of an LC/MS interface include: 1) the volatility of the compounds of interest in relation to the operating temperature of the interface; 2) the solvent rejection of the device with respect to the LC flow rate and MS pumping speed; and 3) the minimum quantities of material available for detection.

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Retention indices are used to predict the retention time of the esters of chlorophenoxy acids. The total retention index is divided into 3 additive components: the alcohol contribution, the acid contribution, and the interaction contribution. This paper discusses 5 acids which are commonly used as herbicides, 8 alcohols, and 3 GLC columns.