By D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)
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Extra info for A Practical Course in Agricultural Chemistry
30. THE DETERMINATION OF MAGNESIUM BY ATOMIC ABSORPTION Reagents required 1. A series of magnesium standards is required: 1, 2, 3, 4, 5 and 6 ppm. A concentrated standard is first prepared by carefully cleaning a strip of magnesium ribbon, weighing out 0-5 g and dissolving in 10 ml of normal hydrochloric acid; this is made up to 500 ml in a graduated flask with distilled water. From this concentrate a 100 ppm standard is prepared by diluting 10 ml to 100 ml with 0-5 normal acetic acid. T h e required standards are now prepared by diluting 1 ml of this solution to 100 ml with the acetic acid for every 1 ppm required.
Tintometer T H E ANALYSIS O F SOILS 37 Limited manufacture a colour standard disc for use in the Lovibond comparator; this is the basis of a field method. Reagents required 1. Buffer solution: This is prepared by dissolving two "Soloid" pH 6-99 buffer tablets in 300 ml distilled water. 2. Nitrazine yellow indicator: Since different batches of nitrazine yellow have different colours at a particular pH value, if the standard Tintometer disc is to be used, the nitrazine yellow should be that supplied by Tintometer.
10 ml of the soil extract and 10 ml of absorption buffer are pipetted into a test-tube and well shaken. 2. T h e series of standard solutions are prepared in a similar manner. 3. T h e atomic absorption apparatus is set as described in the maker's instructions. 4. Spray the standard solutions to obtain approximate readings. 5. Spray the unknown solutions and note the reading. 6. Spray the standard that most nearly approaches the concentration of the unknown and note the reading. 7. Check the reading of the unknown and that of the standard.
A Practical Course in Agricultural Chemistry by D. W. Gilchrist Shirlaw and J. E. Nichols (Auth.)