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Marble. Reception rules. Methods of sampling and sample preparation for laboratory testing
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Surface active agents. Preparation of water with known calcium hardness
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Concentrated kaolin. Method for determination of aluminium oxide (III)
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Phosphorus and inorganic phosphorus compounds. Method of sulphate determination
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Hydrochloric acid for industrial use. Determination of iron content 2,2`-bipyridyl spectrophotometric method
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