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Sample preparation in crucible atomizers for determining cadmium and lead in natural water by atomic absorption

“…The basic model of the block was consid ered elsewhere [13]. Atomization block was mounted at a Saturn 2 AA spectrophotometer and another apparatus with a deuterium background corrector [7,9,13]. Before the experiments, graphite atomizerevaporators were annealed at a temperature of 2500°C to eliminate impurities.…”

“…Ele ments were preconcentrated and suspended matter was separated from unfiltered samples in a microcol umn crucible established in a specially equipped accommodation on the river bank (about 0.5 m from the river bank) both immediately after sample collec tion and in a stationary laboratory. The experience of dynamic preconcentration in microcolumn crucibles [9,10] was taken into account. A crucible holder of organic glass was mounted at a table.…”

“…The most promising technique is to obtain concentrates directly in the atomizer; under laboratory conditions, elements are concentrated on a solid diethylenetri amine tetraacetate (DETATA) sorbent and suspended matter is separated from water and solution samples in a microcolumn crucible. Next, the sample preparation is continued with the simultaneous application of sev eral techniques for suppressing the effect of the matrix components [9,10].…”