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This standard specifies the salicylic acid spectrophotometry to determine ammonia nitrogen in water. This standard applies to determination of ammonia nitrogen in groundwater, surface water, domestic sewage, and industrial wastewater. When the sample volume is 8.0 ml and the 10 mm cuvette is used, the detection limit of this method is 0.01 mg/L, the determination lower limit is 0.04mg/L, and the determination upper limit is1.0mg/L (all counted in N). When the sample volume is 8.0 ml and the 30mm cuvette is used, the detection limit of this method is 0.004 mg/L, the determination lower limit is 0.016mg/L, and the determination upper limit is 0.25mg/L (all counted in N).
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