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水质分析常用二磺酸酚比色法测定硝态氮。该法干扰离子多、操作烦琐、费时。若用硝酸根电极法,则简便、快速,干扰离子少。测定方法1.标准加入法取试样10.00毫升,加10.00毫升 TISAB 液(0.5M 磷酸二氢钠总离子强度缓冲液)置于50毫升小烧杯中,混匀15.00毫升试样,5.00毫升 TISAB 液也可),插入电极,静置6分钟,测定毫伏数后,准确加入一定量的0.2M 硝酸钠标准液(体积不超过0.40毫
Water quality analysis commonly used bisulfonic acid phenol colorimetric determination of nitrate nitrogen. The law of ion interference, cumbersome operation, time-consuming. If the nitrate electrode method, the simple, fast, less interference ions. Assay method 1. Standard addition method Take 10.00 ml sample, add 10.00 ml TISAB solution (0.5M sodium dihydrogen phosphate total ionic strength buffer) placed in a small 50 ml beaker, mix 15.00 ml sample, 5.00 ml TISAB solution Can also), insert the electrode, allowed to stand for 6 minutes, after the determination of millivolts, accurately add a certain amount of 0.2M sodium nitrate standard solution (the volume does not exceed 0.40 milliliters