The test solution with a validity period of three months includes: the <br><br>saturated solution of the acidic stannous chloride test solution has a validity period of 12 months. <br>Test solutions valid for 12 months include: <br>Folin test solution (stock solution) <br>saturated mercury chloride solution <br>saturated potassium chloride solution <br>standard arsenic solution (stock solution) <br>alkaline mercury potassium iodide test solution
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