Determination of trace amounts of gold in waste water by graphite furnace atomic-absorption spectrophotometry with preconcentration on trioctylphosphine oxide chemically modified tungsten wire matrix.
Preconcentration on a trioctylphosphine oxide (TOPO) chemically modified tungsten wire matrix followed by graphite furnace atomic-absorption spectrophotometry measurement is described for the determination of trace gold in waste water. The TOPO modified tungsten wire matrix, after accumulating the gold, is placed in a graphite cup for direct atomization and measurement. Under the selected conditions, the absorbance is proportional to the concentration of gold over the range 0.4-18 ng/ml and the detection limit is 0.2 ng/ml. This method is sensitive and convenient. It has been applied to some waste waters with satisfactory results.
Guanghan
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L
Department of Chemistry, Central China Normal University 430070, Wuhan, People's Republic of China.
Jinya
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X
Tongming
X
X
Litong
J
J
Yuzhi
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F