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Chemicals used for treatment of water intended for human consumption - Sodium disulfite
90.00 Start of review/2 Year Review Enquiry
Chemicals used for treatment of water intended for human consumption - Ammonium sulfate
90.00 Start of review/2 Year Review Enquiry
Chemicals used for treatment of water intended for human consumption - Sodium sulfite
90.00 Start of review/2 Year Review Enquiry
Cryolite, natural and artificial — Preparation and storage of test samples
90.93 Standard confirmed
Cryolite, natural and artificial — Determination of silica content — Reduced molybdosilicate spectrophotometric method
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Samples and methods of test — General
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Calculation of the ratio : silicon dioxide/sodium oxide or silicon dioxide/potassium oxide
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric method by insolubilization
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Determination of total alkalinity — Titrimetric method
90.93 Standard confirmed
Cryolite, natural and artificial — Determination of fluorine content — Modified Willard-Winter method
90.93 Standard confirmed
Cryolite, natural and artificial — Determination of iron content — 1,10- Phenanthroline photometric method
90.93 Standard confirmed
Materials for the production of primary aluminium — Dense refractory bricks — Determination of cryolite resistance
90.93 Standard confirmed
Sodium and potassium silicates for industrial use — Preparation of solution of products not easily soluble in boiling water and determination of matter insoluble in water
90.93 Standard confirmed
Sodium hydrogen carbonate for industrial use — List of methods of test and preparation of the test sample
90.20 Standard under periodical review
Sodium hydrogen carbonate for industrial use — Determination of sodium hydrogen carbonate content — Titrimetric method
90.20 Standard under periodical review
Cryolite, natural and artificial — Determination of sodium content — Flame emission and atomic absorption spectrophotometric methods
90.93 Standard confirmed
Cryolite (natural and artificial) — Determination of aluminium content — 8- Hydroxyquinoline gravimetric method
90.93 Standard confirmed
