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ISO 979:1974PublishedSodium hydroxide for industrial use — Method of assayISO 981:1973PublishedSodium hydroxide for industrial use — Determination of chloride content — Mercurimetric methodISO 3196:1975PublishedSodium hydroxide for industrial use — Determination of carbonates content — Titrimetric methodISO 5993:1979PublishedSodium hydroxide for industrial use — Determination of mercury content — Flameless atomic absorption spectrometric methodISO 7108:1985PublishedAmmonia solution for industrial use — Determination of ammonia content — Titrimetric methodISO 7109:1985PublishedAmmonia solution for industrial use — Determination of residue after evaporation at 105 degrees C — Gravimetric methodISO/R 977:1969WithdrawnWithdrawal of ISO/R 977-1969ISO/R 978:1969WithdrawnWithdrawal of ISO/R 978-1969ISO 980:1976WithdrawnSodium hydroxide for industrial use — Determination of carbonates content — Gas-volumetric methodISO 982:1976WithdrawnSodium hydroxide for industrial use — Determination of sulphate content — Barium sulphate gravimetric methodISO 983:1974WithdrawnSodium hydroxide for industrial use — Determination of iron content — 1,10- Phenanthroline photometric methodISO 984:1974WithdrawnSodium hydroxide for industrial use — Determination of silica content — Reduced silico-molybdic complex photometric methodISO 985:1976WithdrawnSodium hydroxide for industrial use — Determination of silica content — Gravimetric method by precipitation of quinoline molybdosilicateISO 986:1976WithdrawnSodium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric methodISO/R 987:1969WithdrawnWithdrawal of ISO/R 987-1969ISO/R 988:1969WithdrawnWithdrawal of ISO/R 988-1969ISO/R 989:1969WithdrawnWithdrawal of ISO/R 989-1969ISO 990:1973WithdrawnPotassium hydroxide for industrial use — Method of assayISO 991:1976WithdrawnPotassium hydroxide for industrial use — Determination of carbonates content — Gas-volumetric methodISO 992:1975WithdrawnPotassium hydroxide for industrial use — Determination of chlorides content — Mercurimetric methodISO 993:1976WithdrawnPotassium hydroxide for industrial use — Determination of sulphate content — Barium sulphate gravimetric methodISO 994:1973WithdrawnPotassium hydroxide for industrial use — Determination of iron content — 1,10- Phenanthroline photometric methodISO 995:1975WithdrawnPotassium hydroxide for industrial use — Determination of silica content — Reduced molybdosilicate photometric methodISO 996:1976WithdrawnPotassium hydroxide for industrial use — Determination of silica content — Gravimetric method by precipitation of quinoline molybdosilicateISO 997:1976WithdrawnPotassium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) complexometric method