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[Ion chromatography for determination of ammonia sampled by silica gel in air of workplace]
Zhen-lin Liu1, He-xia Zha, Jin-hua Yuan
1Nanjing Center for Disease Control and Prevention, Nanjing, Jiangsu 210003, China.
Objective:
To establish an ion chromatography (IC) method for determination of ammonia in air of workplace.
Methods:
Ammonia in workplace air was collected in silica gel tube, desorbed with 10 mmol/L methanesulfonic acid by ultrasonic for 10 min, determined by IC.
Results:
The linearity range was 0.02-1.00 microg/ml. The linear equation was Y = 12041X-187 (r = 0.9997). The limit of quantification was 0.13 mg/m3 (the air volume was 1.5 L). Collection efficiency was 100%. Extraction efficiency was 99%. The relative standard deviation was 4.2%-6.3%. The penetration capacity was more than 264 microg. Sample could be stored for 14 days at least by ambient storage.
Conclusion:
This method is convenient, applicable and sensitive, suitable to determinate ammonia in air of workplace.
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