Head-space gas chromatography was used to determinate Benzene homologues in water,capillary chromatographic column was used and satisfactory separation was attained.External standard method was adopted in the determination.Linear relationships between values of peak area and mass concentration of the analytes were obtained in the ranges of 0.01 ～ 1.0 mg/L for the Benzene homologues.RSD of RF was found in ranges of 1.52% to 5.43%.Detection limits(3S/N) of method were in range of 1.50×10-3 to 2.60×10-3 mg/L.Recovery and precision of method were tested by standard addition method using a blank water sample as matrix.Values of recovery and RSD’s(n=7) found were in ranges of 84.67% ～ 92.85% and 0.69% ～ 2.85% respectively.

A method was proposed for the separation and determination of five tepyridine derivatives by high performance liquid chromatography. The separation was carried out on a Symmetry C18 （3.9mm i. d. x 150mm, 5~m） column with methanol-water （8：2） as mobile phase and detection wavelength （280nm） in room tempera- ture, isotropic elution. Measurement could be finished in 15min with a good linearity for samples concentration range from 0.1 ~g/mL to 400p~g/mL and the relative standard deviation below 2.2%. This method is simple, efficient, and accurate.

To minimize the errors of determination of sulphate in water and improve the precision and accuration of Luminosity-Method of Barium-Chromate,eccentric separation was applied to replace the filtration separation.The improved method revealed perfect linear relationship in determining the standard series at the range of 0～200mg/L.The regression equation was y=0.1129x-0.0030,γ=0.9992.The detection limit was 7.10 mg/L.The recovery rates and RSDs ranged from 96% to 104% and 0.45% to 2.37% respectively.The results showed no significant differerce(t=0.24,P0.01).The method of eccentric separation can be applied to enhance the accuracy of Luminosity-Method of Barium-Chromate to measure the sulfate in the water.

以洛阳市地表水阴离子洗涤剂为监测对象,经观察多年的监测数据及实验发现该地区地表水中阴离子洗涤剂含量低,且干扰物质少。在对照《水和废水监测分析方法》(第3版)中亚甲蓝分光光度法的基础上简化了测定方法,经对比实验结果表明,该方法可获得满意的结果。

An improved method to prepare buffer solution for measuring total hardness of surface water and groundwater was introduced. This method can be used in analytic determination of water quality through contrast experiment.