A spot test for nitrite and nitrate detection by color band length and number of colored zebra-bands formed in a mini-column

作者：Niki Keizou; Kiso Yoshiaki^*; Takeuchi Takanori; Hori Tatsuaki; Oguchi Tatsuo; Yamada Toshiro; Nagai Masahiro

来源：Analytical Methods, 2010, 2(6): 678-683.

DOI：10.1039/b9ay00309f

A detecting tube for nitrite and nitrate monitoring was developed as a spot test. The detecting tube was prepared by packing of poly(vinyl chloride) (PVC) particles coated with a quaternary ammonium salt into a mini-column. A nitrite solution was treated with sulfanilic acid and 1-naphthol, the resultant colored solution was drawn into the detecting tube by suction with a syringe, and a color band was formed in the tube The color band length (CBL) corresponded to the nitrite concentration Nitrate was also detected; after reduction with zinc The nitrite and nitrate content of domestic wastewater samples was successfully detected by this method over the range of 0 5-45.3 mg-N L(-1) as nitrogen concentration Another type of detecting tube was prepared by alternately packing adsorbent and uncoated PVC particles in a mini-column. Colored zebra-bands were formed in this column, and the nitrite concentration was detected by counting the number of colored zebra-bands. Nitrite and nitrate concentrations in actual wastewater samples were detected more easily by this method, although the accuracy was somewhat lower than that obtained with the CBL method.

• 出版日期2010-6