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300T per hour self grinding mill for pyrite in liberia

Standard solution was prepared with 1% hydrochloric acid containing 0.01 mg dimetbylaniline per 1 ml, from which was prepared a standard scale con- taining corresp~ndingly 0, 0.001, 0.002, 0.004, 0.006, 0.008 and 0.01 mg dimeth- ylani1ine per 1 mI. Into each test tube of the scale 0.2 m1 of 10% sodium ni- trite solution was added.

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