Two simple and quick methods of the determination of nitrate nitrogen in water were discussed,the result showed that nitrate radical potentio metric analysis determinates nitrate nitrogen in water,it had more higher accuracy,precision and anti-interference than phenol disulfonic acid spectrophotometry.

Adsorption of xylenol orange by chitosan;

Preparation of boron doping nano-TiO_2 and their photocatalytic performance for xylenol orange degradation;

Dual Surfactants Coordinate Enhancement for Spectrophotometric Determination of Cadmium by Xylenol Orange;

Photometric Determination of Trace Iead(II) by the Reaction with XO in the Presence of CPC;

Analysis of the Characteristic Factors of Iron(Ⅲ) Complex with XO by Dual-Wavelength Beta-Correction Spectrophotometry;

XO, NiXO, ZnXO and CuXO were separated within 8 minutes on a C 18 column when eluted with acetonitrile water (12∶88, V/V) containing 28.

The comparison analysis of nitrate nitrogen determination is conducted with the same standard solution and natural water samples by two methods of spectrophotometric method with phenol disulfonic acid and ultraviolet spectrophotometer.

By the way of spectrophotometric method with phenol disulfonic acid monitoring nitrate nitrogen in water, the concentration of standard solution will reduce by the reason of error brought by the processing of drawing standard curve.