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- [37] AUTOMATED TITRATION OF SUB-MICROGRAM AMOUNTS OF METAL-IONS IN AQUEOUS-SOLUTIONS .1. CHELOMETRIC TITRATION OF COPPER(II), ZINC(II), CADMIUM(II) AND LEAD(II), USING ONE SIMPLE ION-SELECTIVE ELECTRODE FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1974, 270 (03): : 184 - 186