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7.4 Before carrying out the analysis, check that the apparatus is working properly and that the correct application of the method is used with a standard solution containing quantities of ammoniacal and nitrate nitrogen comparable to the quantities of cyanamide and nitrate nitrogen contained in nitrated calcium cyanamide.
For this purpose place 20 ml of the standard solution (4.13) in the Kjeldahl flask.
Carry out the analysis according to the method described in paragraph 7.
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