A programme was undertaken in order to quantify the heavy-metal contribution from domestic sources with respect to total loads entering a chosen sewage-treatment works. Input waters, household cleaning and body-care products, and wastewater from household appliances, were sampled and analysed for heavy metals. The data were combined with literature values to predict the total load of heavy metals entering the sewage-treatment works from the study catchment.This paper identifies the major domestic sources of heavy metals and quantifies them based upon a catchment model.

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A system is described in which a graphite rod electrothermal vaporisation device is employed for the introduction of microlitre liquid samples, after desolvation, into an inductively coupled argon plasma source for atomisation and excitation for optical emission spectrometry. The analytical performance of the system has been studied and detection limits for 16 elements a t the sub-nanogram level are presented.

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