室内空气中氨的固相吸附气体采样管研制和性能评价

Development and performance evaluation for a solid phase adsorption gas sampler of ammonia in indoor air

目的 研制一种用于室内空气中氨采样测定的固相吸附气体采样管。方法 固相吸附气体采样管是两端套有硅橡胶塞的玻璃管，管内填充带有氨吸收液的合成纤维丝束。建立用该管对室内空气中氨进行采样，采用靛酚蓝比色法测定，并评价其性能。结果固相吸附气体采样管的采样效率、洗脱效率分别为（97．96±0．49）％和（97．91±0．49）％，采样精密度RSD=3．72％（n=10），加标回收率为95．84％。103．280％。该方法与国标气泡吸收法的测定结果经t检验，两种方法差异无显著性。结论 研制的固相吸附气体采样管可用于室内空气中氨的采样测定。

To develop a solid phase adsorption gas sampler, which was suitable for collection and analysis of ammonia in indoor air. Methods This solid phase adsorption gas sampler was composed of two parts, a support part made of a glass tube, an absorbent part in glass tube made of fiber coated ammonia absorbent. For its performance, established a method for sampling ammonia in indoor air with the gas sampler was evaluated. The associated samples were determinated with indophenol blue photometric method. Results For the solid phase adsorption gas sampler, the collection efficiency was 97.96%, and the desorption efficiency was 97.91 %. The variation coefficients of sampling was 3.72% （ n = 10）. The recovery rates varied from 95.84% to 103.28% . The above method was compared with the standard method, the results showed no significant difference between two methods. Conclusion This solid phase adsorption gas sampler could be used for sampling and determination ammonia in indoor air.