EVALUATION OF A HIGH-PURITY AND HIGH-STABILITY CONTINUOUS GENERATION SYSTEM FOR NITROUS-ACID

被引：94
作者：
FEBO, A
PERRINO, C
GHERARDI, M
SPARAPANI, R
机构：
[1] C.N.R., Istituto Inquinamento Atmosferico, 00016 Monterotondo Stazione, Roma, Via Salaria Km 29300
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1995年 / 29卷 / 09期
关键词：
D O I：
10.1021/es00009a035
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A flow-type system for the generation of nitrous acid in the mass flow rate range of 3.5-400 nmol/min is described. The system based on the reaction between gaseous hydrochloric acid, generated by means of a low-pressure permeation device, and solid sodium nitrite allows the continuous production of highly pure nitrous acid (purity > 99.5%) and thus the generation of standard atmosphere in a very wide range of nitrous acid mixing ratio (5-20000 ppb). The system is of easy construction and exhibits a very high reproducibility and excellent long-term output stability. These features allow us to obtain any desired value of nitrous acid mass flow rate by simply tuning the temperature and flow rate values. As a consequence of the high purity of the generated compound, it was possible to obtain a clear absorption spectrum of nitrous acid without performing any correction for NO2 interference.
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页码：2390 / 2395
页数：6
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