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本法用氢氧化钠——过氧化钠分解镍、钴、铁基合金粉末试样,热水浸取,干过滤分离除去铁、镍、钴、铜等干扰元素。以氯化钡、三氯化铁、过氧化氢分离掩蔽铬、钨、钼等干扰元素。用氢氧化钠——甘露醇容量法测定硼。方法操作简便,易于掌握。适用于测定含铬40％、钨30％、钼10％、含硼量为1～4％的合金粉末试样,其相对标准偏差为1.37—2.88％。 称取0.5000克试样置于先熔有1克氢氧化钠的镍坩埚中,加4克过氧化钠,在酒精喷灯上熔至透明,冷却。置于300毫升烧杯
This method uses sodium hydroxide - sodium peroxide decomposition of nickel, cobalt, iron-based alloy powder samples, hot water leaching, dry separation filter to remove iron, nickel, cobalt, copper and other interfering elements. With barium chloride, ferric chloride, hydrogen peroxide masking the separation of chromium, tungsten, molybdenum and other interference elements. Determination of Boron by Sodium Hydroxide - Mannitol Volumetric Method. The method is simple and easy to master. It is suitable for the determination of alloy powder samples containing 40% chromium, 30% tungsten, 10% molybdenum and 1% -4% boron with relative standard deviations of 1.37-2.88%. Weigh 0.5000 grams of the sample placed in a nickel crucible first melted with 1 g of sodium hydroxide, add 4 g of sodium peroxide, melted in an alcohol torch until transparent and cooled. Place in a 300 ml beaker