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For Sodium Sulfide Sodium Sulphide quality control, laboratories perform sampling three times daily. Sodium Sulfide Sodium Sulphide Melting point tests require platinum crucibles, as ordinary porcelain crucibles may cause deviations. Sulfur content is determined using the classic iodometric method, with the titration endpoint identified by the sudden blue coloration of the solution. Heavy metal detection now employs atomic absorption spectrometry, with a detection limit of 0.1 ppm.Sodium Sulfide Sodium Sulphide.