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本文扼要介绍电超滤提取的氮(EUF—N)和硼(EUF—B)的快速测定方法。EUF—N包括NH_4~+、NO_3~-和易溶性含氮化合物(如氨基酸)。测定时先将EUF—N的各种氮素形态用过氧焦硫酸盐(Peroxodisulfate)在紫外线催化条件下氧化为NO_3~-;然后再用硫酸肼将NO_3~-还原为NO_2~-,最后按Griss反应测定亚硝酸盐的含量。采用这种方法不仅比Kjeldahl消化法准确,而且消化时间为15分钟,连测定共需25分钟。测定EUF—B有两种方法,其一是用1.1—二蒽亚胺(1.1 dianthrimide)做显色剂。它能使浓硫酸显浅黄绿色;在非水条件下,硼又能使此溶液变为蓝色。这种蓝色与硼含量成正比,即可在分光光度计上定硼。即使是浓度很
This article briefly introduced the ultrafiltration extraction of nitrogen (EUF-N) and boron (EUF-B) rapid determination method. EUF-N includes NH_4 ~ +, NO_3 ~ - and soluble nitrogen compounds (such as amino acids). In the determination, various nitrogen forms of EUF-N were first oxidized to NO_3 ~ - by peroxodisulfate under ultraviolet light catalytic conditions, then NO_3 ~ - was reduced to NO_2 ~ - by hydrazine sulfate, and finally The Griss reaction measures the nitrite content. Using this method is not only more accurate than the Kjeldahl digestion, but also requires a digestion time of 15 minutes, even with a total of 25 minutes. There are two methods for the determination of EUF-B, one of which is the use of 1.1 dianthrimide as a chromogenic agent. It makes the concentrated sulfuric acid show a light yellow-green; under non-aqueous conditions, boron can make this solution turn blue. This blue is proportional to the boron content, you can set the boron in the spectrophotometer. Even if the concentration is very high