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ISO 320:1981 Manganese ores — Determination of sulphur content — Barium sulphate gravimetric methods and sulphur dioxide titrimetric method after combustion
ISO 619:1981 Manganese ores — Determination of chromium content — Diphenylcarbazide photometric method and silver persulphate titrimetric method
ISO 549:1981 Manganese ores — Determination of combined water content — Gravimetric method
ISO 4192:1981 Aluminium and aluminium alloys — Determination of lead content — Flame atomic absorption spectrometric method
ISO 4193:1981 Aluminium and aluminium alloys — Determination of chromium content — Flame atomic absorption spectrometric method
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