| Autor: |
Satoshi Ohrui, Hiroyuki Kataoka, Masami Makita, Akiko Kanemoto |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Journal of Chromatography A. 633:311-314 |
| ISSN: |
0021-9673 |
| DOI: |
10.1016/0021-9673(93)83169-s |
| Popis: |
A selective and sensitive method for the determination of ammonia by gas chromatography (GC) was developed. Ammonia was converted into its benzenesulphonyldimethylaminomethylene derivative by a convenient procedure involving benzenesulphonylation with benzenesulphonyl chloride and subsequent reaction with dimethylformamide dimethyl acetal, and was determined by GC with flame photometric detection (FPD) using a DB-1 capillary column. The derivative was very stable on standing in ethyl acetate, eluted as a single peak and provided an excellent response in the flame photometric detector. A linear calibration graph was obtained in the range 2–40 nmol of ammonia. The detection limit of ammonia was about 1.5 pmol injected. Ammonia in environmental water samples could be measured without interference from co-existing substances. The recoveries of ammonia added to environmental water samples were 95.0–97.5% and the relative standard deviations were 3.3–6.0%. Ammonia contents in several environmental water samples were 0–119.3 nmol/ml. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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