Effects of ammonium nitrate on sensitivity for determinations of copper, iron, and manganese in sea water by atomic absorption spectrometry with pyrolytically coated graphite tubes
✍ Scribed by John R. Montgomery; Gary N. Peterson
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 428 KB
- Volume
- 117
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Ammonium nitrate, used as a matrix modifier in sea-water analysis to eliminate the interference of sodium chloride, degrades the pyrolytic coating on graphite-furnace tubes. The initially increased sensitivities for copper, manganese and iron are maintained for up to 15 atomizations; there is then a rapid decline to a constant lower sensitivity.
The characteristics depend strongly on the particular lot of furnace tubes. To decrease the NaCl interference wit,hout using matrix modifier, estuarine samples must be diluted (1 + 1) with pure water. Blanksand standards are prepared and diluted with Guif Stream water containing tow amounts of trace metals to match the estuarine matrix.