The ammonia nitrogen in wastewater is determined by direct measurement with the Orion 95-12 gas-sensing electrode on the Orion Star meter. The method requires no titration and has no turbidity or color interferences. Pre-distillation of the sample may be required for EPA reporting purposes. Refer to Part 4500-NH3 B in Standard Methods or ASTM D1426 Appendix X1 for sample distillation procedures.

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