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Determination of the purity of the elemental sulfur.
Certain substances may have been extracted by the carbon disulfide at the same time as the elemental sulfur. The purity of the elemental sulfur is determined as follows:
homogenize the contents of the flask as thoroughly as possible and remove 2 – 3 g, weigh to an accuracy of 1 mg (n). Place in the petri dish (5.5). Weigh dish and contents together (P2). Place on the hot plate (5.6), set at a temperature not exceeding 220° C so as not to cause combustion of the sulfur. Continue sublimation for three to four hours until a constant weight is obtained (P3).
Note:For some fertilisers, it may not be necessary to determine how pure the sulfur is. In this case, omit step 7.3.
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