公开(公告)号：US3877875A

公开(公告)日：1975-04-15

申请号：US38074073

申请日：1973-07-19

Applicant: BECKMAN INSTRUMENTS INC

Inventor： JONES ROBERT H ,  JOHNSTON MICHAEL B

IPC: G01N31/00 ,  G01N25/22

CPC classification number: G01N31/005 ,  Y10T436/172307 ,  Y10T436/176152

Abstract: A unitary system is provided with separate channels for detecting and analyzing different types of nitrogen-containing compounds, particularly those which may be encountered in waste treatment or in pollution control or in food product analysis. The channels are so designed that an injected sample is acted upon in gaseous or suspended form, with reaction products thereof carried through the system by carried gas and ultimately converted to nitric oxide for analysis in a nitric oxide analyzer. Each channel contains reaction columns packed with a suitable substance. There is a total combined nitrogen channel in which a sample is first catalytically oxidized to form nitric oxides. In a nitrite-nitrate nitrogen channel a sample is first treated to form nitrites and injected into a reaction column packed with an acidifying substance and in an ammonia nitrogen channel the sample is injected into a reaction column packed with an alkalyzer before proceeding to a reaction column packed to catalytically oxidize the resulting ammonia to nitrogen dioxide and nitric oxide. In a modified embodiment a suitably pretreated sample suspected of cyanide content may also ultimately be converted to nitric oxide for analysis.

Abstract translation: 提供单一系统，用于检测和分析不同类型的含氮化合物，特别是在废物处理或污染控制或食品分析中可能遇到的那些。 通道被设计成使得注射的样品以气态或悬浮形式起作用，其反应产物通过载体气体运送到系统中，并最终转化为一氧化氮以在一氧化氮分析仪中进行分析。 每个通道都含有装有合适物质的反应塔。 存在总共合并氮通道，其中样品首先被催化氧化以形成一氧化氮。 在亚硝酸盐 - 硝酸盐氮气通道中，首先处理样品以形成亚硝酸盐并注入装有酸化物质的反应塔中，并且在氨氮通道中，将样品注入装有烷烃的反应塔中，然后再进行反应柱 包装以将所得氨催化氧化成二氧化氮和一氧化氮。 在修改的实施方案中，怀疑氰化物含量的适当预处理的样品也可最终转化为一氧化氮进行分析。