A new sampling procedure for individual raindrops with volumes of 4 nl -4 p1 is presented. It is demonstrated that analyte concentrations in small volumes can be analysed usin! micro-HPLC and capillary zone electro horesis (CZE). Results for the analysis of cations such as Na', NH4+, K , Mg2+, Ca2', and anions such as Cl-, so4 , NO3 , N S and organic acids are given and discussed.

Abstract. Inorganic ions can be analyzed in small volumes using micro-liquid chromatography (micro-LC) and capillary zone electrophoresis (CE). Results for the analysis of alkali, alkaline earth, and ammonium cations as well as the main organic and inorganic anions are given and discussed. For the determination of the cations in micro-LC and CE, cerium(II1) was chosen as eluent and electrolyte, respectively. Micro-LC anion analysis was camed out with hexacyanoferrate(I1) and -(I10 and indirect photometric detection. In CE 2,5-dihydroxybenzoic acid was used as the fluorescent electrolyte for indirect detection. For CE sample introduction an injection port was developed to handle volumes smaller than 1 pL.

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