Potentiometry for Cyanide Detection Applied to Fisheries Regulation

Illegal cyanide fishing is practiced by some fishers to capture agile and otherwise inaccessible reef fishes easily. Economic incentives had prevented discontinuation of the practice despite regulations present. Aside from well-known toxicity cyanide, it a concern whether fish for ornamental purposes or human consumption that being used because environmental damage can cause killing off non-target species. Currently, content determined using an ion-selective electrode (ISE), with distillation as mode extraction tissues. This paper reports modification ASTM Method 500-CN-E, method originally test in wastewater. outlines process determining applicability analysis tissue samples, which no standard was designed specifically matrix mentioned above. Although percent recoveries at 0.05-10 mg/L range spiked distilled water matrices are line American Society Testing Materials (ASTM) results (90-105%), same concentration appreciably lower (~60-80%). For regulatory purposes, serves temporarily acceptable detect cyanide-laden until suitable be validated on international standards. However, accepted method, additional modifications may needed proven inter-laboratory tests recovery consistently low.