Org. and other volatile metal(loid) species (e.g. hydrides) in environmental gases can be detd. with high sensitivity and selectivity by low-temp. gas chromatog. coupled online to plasma mass spectrometry (LTGC/ICP-MS). A std. ref. soln. is analyzed simultaneously for calibration of the results as well as for monitoring the excitation conditions in the plasma. This highly sensitive anal. method was applied in field screening tests at Cu and Hg deposits in Germany. In some of the soil gas and soil samples investigated, org. compds. of several elements (e.g. As, Hg) could clearly be identified. The implications of these results with respect to potential use of organometal(loid) species in geochem. exploration are discussed.