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Flameless: 0.0004 mg//(solution)<br />
B. Reagents<br />
1 % bromine water solution.<br />
Chelating reagent: ammonium pyrrolidinedithiocarbamate (APDC) or sodium diethyldithiocarbamate<br />
(DEDC). Prepare a 5% solution with deionized-distilled water. Extract at least twice with methyl<br />
isobutyl ketone (MIBK).<br />
Methyl isobutyl ketone (MIBK) (distil.led).<br />
C. Extraction<br />
( I) Place 220 ml of sample in 2S0-ml flask .<br />
(2) Add 1.2 ml of I % bromine water solution and warm on water bath until bromine colour<br />
disappears; cool. Transfer to SOO-ml acid-washed separatory funnel.<br />
(3) Add 5 ml chelating reagent and 5 ml of MIBK. Shake thoroughly for 3 min and save organic<br />
extract (top) layer for analysis.<br />
D. Analysis<br />
Because of the low metal concentrations, the flameless attachment of the spectrometer may have to be<br />
used. Check manufacturer's handbook.<br />
6.6 Copper (Atomic Absorption)<br />
I. Concentrations<br />
Average river water = 10 /Lg/ /<br />
Average nearshore sediment 48 mg/kg<br />
Sea water
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