| Abstrakt: |
The article discusses how to differentiate metal from ammonia toxicity in toxicity identification evaluations. Toxicity Identification Evaluation (TIE) studies have indicated that ammonia is often partly responsible for the toxicity of sediment samples. Within standard TIE procedures, the graduated acidity test and EDTA-chelation are treatments that have been proposed as methods to differentiate between ammonia and metal toxicity. EDTA-chelation is used as an indicator of metal toxicity. However, it is not clear from literature whether EDTA can also influence ammonia toxicity. Most positively charged ions will interact with EDTA to some extent, but especially divalent transition metals, including cadmium, copper, nickel, lead and zinc, have high affinities. |
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