海水中的硝酸盐不仅是海洋植物所必需的重要营养盐,而且对研究海洋水团动力学、海洋化学、海洋地貭学和生物起源学等也是很有意义的。目前海水中硝酸盐的測定方法主要有下面四个方面: 1.馬錢子碱法。該法虽有一定的灵敏度,但操作复杂麻煩,影响因素多。 2.二苯胺法和二苯基联苯胺法。該法虽比馬钱子碱法好,但仍存在許多困难,技术較难掌握,重现性差,甚至往往不显蓝色,或所生顏色不成色阶等。 Nitrates in seawater are not only important nutrients necessary for marine plants, but also of great interest for the study of ocean water mass dynamics, marine chemistry, marine geography, and biological origin. At present, the determination of nitrate in seawater mainly includes the following four aspects: 1. Strychnine method. Although the method of a certain degree of sensitivity, but the operation complicated and troublesome, many factors. Diphenyl amine method and diphenyl benzidine method. Although the method is better than strychnine, there are still many difficulties, techniques are difficult to grasp, poor reproducibility, and often do not show the blue, or the birth of the color sub-standard.