Simultaneous determination of 6 indexes in water by continuous flow analyzer

Objective To improve a method for simultaneous determination of volatile phenol, cyanide, anionic synthetic detergent, total phosphorus, total nitrogen, and sulfide in water by continuous flow analyzer.

Methods Two continuous flow analyzers in parallel were used to simultaneously determine the contents of volatile phenol, cyanide, anionic synthetic detergent, total phosphorus, total nitrogen, and sulfide in water after online distillation, extraction and ultraviolet digestion.

Results The correlation coefficients (r) of volatile phenol, cyanide, anionic synthetic detergent, total phosphorus, total nitrogen, and sulfide were all above 0.999 within the linear range, with detection limits of 0.001, 0.0003, 0.032, 0.015, 0.037 and 0.011 mg/L, respectively. The relative standard deviation (RSD) of each indicator ranged from 0.42%-4.22% at different concentrations, with a recovery of 94.0%-106.0%.

Conclusion This method is simple and rapid with a low detection limit, high precision, and good accuracy, which meets the requirements of laboratory quality control, and is suitable for the analysis of large quantities of samples.