公开(公告)号：WO1994007134A1

公开(公告)日：1994-03-31

申请号：PCT/US1993008593

申请日：1993-09-13

Applicant: ROSEMOUNT ANALYTICAL INC.

Inventor： ROSEMOUNT ANALYTICAL INC. ,  TAKAHASHI, Yoshihiro

IPC: G01N31/00

CPC classification number: G01N31/12 ,  G01N31/005

Abstract: A method and apparatus for determining Total Nitrogen Content and/or Combined Nitrate-Nitrite Nitrogen Content in an aqueous system is disclosed. To measure the Total Nitrogen Content, an oxidation tube (12) having an oxidation catalyst (32) receives a carrier gas (20) including oxygen and a sample (13) of the aqueous system. The oxidation tube (12) converts the aqueous sample (13) to a product gas including nitrogen dioxide. The nitrogen dioxide is then converted to nitric oxide in a reaction chamber (14) having a liquid chemical reduction agent (41). The nitric oxide is received and measured to determine the Total Nitrogen Content by a detection apparatus (18). To measure the Combined Nitrate-Nitrite Nitrogen Content in the aqueous system, a second aqueous sample (43) is injected into the reaction chamber (14) and converted to a second quantity of nitric oxide. The second quantity of nitric oxide is received and measured by the detection apparatus (18).

Abstract translation: 公开了一种用于测定含水体系中的总氮含量和/或硝酸盐 - 亚硝酸盐氮含量的方法和装置。 为了测量总氮含量，具有氧化催化剂（32）的氧化管（12）接收包含氧的载气（20）和水系统的样品（13）。 氧化管（12）将含水样品（13）转化成包括二氧化氮的产物气体。 然后在具有液体化学还原剂（41）的反应室（14）中将二氧化氮转化成一氧化氮。 接收并测量一氧化氮以通过检测装置（18）确定总氮含量。 为了测量含水体系中的硝酸盐 - 亚硝酸盐含量，将第二含水样品（43）注入反应室（14）并转化为第二量的一氧化氮。 第二量的一氧化氮被检测装置（18）接收和测量。

公开(公告)号：EP0660927A1

公开(公告)日：1995-07-05

申请号：EP93921515.0

申请日：1993-09-13

Applicant: ROSEMOUNT ANALYTICAL INC.

Inventor： TAKAHASHI, Yoshihiro

IPC: G01N31

CPC classification number: G01N31/12 ,  G01N31/005

Abstract: A method and apparatus for determining Total Nitrogen Content and/or Combined Nitrate-Nitrite Nitrogen Content in an aqueous system is disclosed. To measure the Total Nitrogen Content, an oxidation tube (12) having an oxidation catalyst (32) receives a carrier gas (20) including oxygen and a sample (13) of the aqueous system. The oxidation tube (12) converts the aqueous sample (13) to a product gas including nitrogen dioxide. The nitrogen dioxide is then converted to nitric oxide in a reaction chamber (14) having a liquid chemical reduction agent (41). The nitric oxide is received and measured to determine the Total Nitrogen Content by a detection apparatus (18). To measure the Combined Nitrate-Nitrite Nitrogen Content in the aqueous system, a second aqueous sample (43) is injected into the reaction chamber (14) and converted to a second quantity of nitric oxide. The second quantity of nitric oxide is received and measured by the detection apparatus (18).