中英文对照版二氧化硅质量标准

1M盐酸，维生素C，的氨水，
稀氨水（R2）：取14g浓氨水用水稀释到100ml。氨的含量为3.3％－3.5％，约2M。
稀盐酸：取20g浓盐酸用水稀释到100ml，含量为7.3%w/v
标准铅溶液（1ppm Pb）:取10ppmPb标准铅溶液用水稀释10倍，临用前配制。
标准铅溶液（10ppm Pb）:取100ppmPb标准铅溶液用水稀释10倍，临用前配制。
3.1.2 Method
值
仪器
方法
Chlorides (2.4.4)
3.2.1 Reagent
3.2.2 Method
3.2氯化物
试剂
方法
3.3Heavy metals (2.4.8)
正文
pH meter
Shake 1.0 g with 30 ml ofcarbon dioxide-free water R. The pH of the suspension is 3.5 to 5.5.
pH计
参照B.P.附录（）。取本品，加入30ml不含二氧化碳的水，振摇后检查混悬液的pH值为。
Nitric Acid, Dilute：Dilute 20 g ofnitric acidto 100 ml withwater. Contains about 12.5% w/v of HNO3(about 2M).
Ammonia, Concentrated：M).
Ammonia R2, Dilute：Dilute 14 g ofconcentrated ammoniato 100 ml withwater. The solution contains not less than 3.3% and not more than 3.5% of NH3(about 2M).
1Mhydrochloric acid;ascorbic acid
Suspend 2.5 g in sufficientwater Rto produce a semi-fluid slurry. Dry at 140°C. When the dried substance is white, break up the mass with a glass rod. Add 25 ml of1Mhydrochloric acidand boil gently for 5 min, stirring frequently with the glass rod. Centrifuge for 20 min and filter the supernatant liquidthrough a membrane filter. To the residue in the centrifuge tube add 3 ml ofdilute hydrochloric acid Rand 9 ml ofwater R
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3.3.1 Reagent
3.3.2 Method
正文
Hydrochloric Acid：Dilute Dilute 20 g ofhydrochloric acidto 100 ml withwater. It contains 7.3% w/v of HCl.
轻质，白色，无定形细粉。粒子大小约15nm，不溶于水和矿物酸，氢氟酸除外。可溶于热碱液中。
a lead or platinum crucible;a copper wire
sodium fluoride;sulphuric acid
About 20 mg gives the reaction of silicates (2.3.1).
a platinum crucible
Not more than 5.0 per cent, determined on 0.200 g by ignition in a platinum crucible at 900°C for 2 h. Allow to cool in a desiccator before weighing.
In a lead or platinum crucible mix to a thin slurry using a copper wire the prescribed quantity of the substance being examined with 10 mg ofsodium fluorideand 0.2 ml ofsulphuric acid. Cover the crucible with a thin, transparent plate of plastic from which a drop ofwateris suspended and warm gently. A white ring is rapidly produced around the drop of water.
Lead Standard Solution (1 ppm Pb) Dilute 1 volume oflead standard solution (10 ppm Pb)to 10 volumes withwaterimmediately before use.
Lead Standard Solution (10 ppm Pb) Dilute 1 volume oflead standard solution (100 ppm Pb)to 10 volumes withwaterimmediately before use.
Lead Standard Solution (100 ppm Pb) Dilute 1 volume oflead standard solution (0.1% Pb)to10 volumes withwaterimmediately before use.
Lead Standard Solution (0.1% Pb) Dissolve 0.400 g oflead(II)nitratein sufficientwaterto produce 250.0 ml.
铂金坩埚；
称取克放入铂金坩埚中，在900°C灼烧2小时，在干燥器中放冷，残渣的减少量不得超过5.0%。
sulphuric acid;alcohol;hydrofluoric acid
desiccator;water bath
To the residue obtained in the test for loss on ignition add 0.2 ml ofsulphuric acid Rand sufficientalcohol Rto moisten the residue completely. Add 6 ml ofhydrofluoric acid Rand evaporate to dryness on a hot-plate at 95°C to 105°C, taking care to avoid loss from sputtering. Wash down the sides of the dish with 6 ml ofhydrofluoric acid Rand evaporate to dryness. Ignite at 900°C, allow to cool in a desiccator and
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3.4Loss on ignition
.1 Apparatus
3.4.2 Method
3.4炽灼失重
3.4.1仪器
3.4.2方法
4. Assay
4.1 Reagent
4.2 Apparatus
4.3 Method
正文
离心20min，用同一薄膜滤器过滤。用少量水冲洗残渣，合并滤液和洗液，用水稀释到50ml。向20ml此溶液中加入50mg维生素C和的氨水。用稀氨水（R2）中和。加水稀释至25ml。取12ml参照重金属（25ppm）的限量反应A（B.P.附录）。用1ppm的铅标准溶液配制标准溶液。
参照附录2.4.4；
稀硝酸：取20g浓硝酸用水稀释到100ml，含量为12.5%w/v，约2M
取本品，加入20ml稀硝酸和30ml水的混合液，在水浴上加热15min，不断振摇。如有必要，可用水稀释到50ml，过滤后放冷。取10ml滤液用水稀释到15ml，参照氯化物的限量检查(B.P.附录2.4.4)（250ppm）。
约20mg本品能产生硅酸盐反应
铅或铂坩埚，铜线
氟化钠，浓硫酸
取规定量的供试品和10mgNaF，浓硫酸，置于铅或铂坩埚中，用铜线搅拌成稀浆状。在坩埚上盖一片薄的透明塑料板，加一滴水使缓慢加热。在水滴的周围立即出现白色的环。
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3.检查
pH (2.2.3)
3.1.1 Apparatus
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分发部门：
标题
1.性状
2.1 Apparatus
2.2 Reagent
2.3 Method
2.鉴别
仪器
试剂
方法
正文
A light, fine, white, amorphous powder, with a particle size of about 15 nm, practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
To 1.0 g add a mixture of 20 ml ofdilute nitric acid Rand 30 ml ofwater Rand heat on a water-bath for 15 min, shaking frequently. Dilutessary, filter and cool. 10 ml of the filtrate diluted to 15 ml withwater Rcomplies with the limit test for chlorides (250 ppm).
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重金属
试剂
方法
正文
and boil. Centrifuge for 20 min and filter the supernatant liquid through the same membrane filter.
Wash the residue with small quantities ofwater R, combine the filtrates and washings and dilute to 50 ml withwater R. To 20 ml of the solution add 50 mg ofascorbic acid Rand 1 ml ofconcentrated ammonia R. Neutralise withdilute ammonia R2. Dilute to 25 ml withwater R. 12 ml of the solution complies with limit test A for heavy metals (25 ppm). Prepare the standard usinglead standard solution (1 ppm Pb) R.
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标准铅溶液（100ppm Pb）:取0.1%标准铅Pb溶液用水稀释10倍，临用前配制。
标准铅溶液（0.1% Pb）:取b(NO3)2，用水配成。
参照B.P.附录（）。取本品加入适量的水制成半流体浆。在140°C下干燥。当干燥物变为白色，用玻璃棒敲碎。加入25ml1M盐酸，缓缓加热至沸腾5min，同时用玻璃棒不断搅拌。离心分离20min，用薄膜滤器过滤。在离心管中向残渣中加入3ml稀盐酸和9ml水，煮沸。