Effectively weigh about 0. 6 g of your product

Barium sulfate (type I)
[Identification] Have about 0. 3g of your product, add 10ml salt carbonate test solution, disect, filter; add hydrochloric acid for the filtrate to determine this acidity, determine the effect of sulfate (Appendix III); bathe the residue with waters, add dilute acetic acid to dissolve the solution, Filter to determine your filtrate (Appendix III).
[Check] Usually take 5. 0g of the product, put 50ml to the measuring cylinder (the distance in the bottom of the tube towards the highest scale should possibly be 11 stoppers, shake strenuously for 1 minute, produce the powder evenly stopped, let stand for 15 minutes, mix the suspension The superior surface should not be lower than 18ml. Take 1. 0g of this product, add 20ml normal water, stir in water bathroom for 5 minutes, filtration system, and divide the filtrate directly into two equal parts: section of bromothymol blue 1 drop indicator liquid, not blue Another component to the addition of bromocresol environment friendly indicator solution, should always be blue. Dissolve the acid from the product 10. 0g, put it from a beaker, add 10ml of dilute hydrochloric acid as well as water 90ml, boil intended for 10 minutes, add drinking water to replenish the evaporated drinking water, let it cool, Filter with filter paper plus wash with hydrochloric plaque created by sugar solution (1→40). If the original filtrate is turbid, it must be filtered repeatedly. Take 50ml with clear filtrate and decide to put it in water. Escape to dryness, add 2 drops regarding hydrochloric acid and 10ml of warm water, stir. Filtration with filtration system paper, washing with hydrochloric acid solution solution (1→40), filtering the residue along with 10 ml of difficulties, combining the washing liquid as well as the filtrate, setting a frequent weight of 105 ° D in an evaporating bowl, evaporating to dryness on the water bath, at 105 Dried out to constant weight on °C, residual residue is not more than 15 mg (0. 3%). The sulfate residue was taken on the residue in the acidity, 10 ml of water was included with the mixture, and the mixture was filtered via a filter paper and washed using a hydrochloric acid solution (1 → 40). 0. 5 ml was put into the filtrate. Dilute sulfuric acidity, let stand for A half-hour, no turbidity. Remove related to 10. 0g of sulfide from your product and check it as outlined by law (Appendix VIII C). Lead acetate test paper can't change color. The fat loss of the product needs to be dried at 105 °C till constant. Weight, weight loss should not exceed 1. 0% (Appendix VIII L). Receive 4g heavy metal, bring 4ml acetic acid barrier (pH3. 5) and 50ml water in making 50ml, boil for TWELVE minutes, let cool, add water 50ml, filter, require 25ml Filtrate, according towards the law (Appendix) VII THEY WOULD first method), containing heavy metals must not exceed 10 parts each million. The arsenic salt should be taken from 2. 0 g of the product, 23 ml of waters and 5 ml of hydrochloric acid need to be added and checked based on law (Appendix VIII J earliest method), which should meet what's needed (0. 0001%).
[Content determination] Effectively weigh about 0. 6 g of your product, place it with platinum crucible, add 10 g of anhydrous sodium carbonate, mix well, burn with a molten state, continue heating for 30 minutes, let it cool, and put it right 400 ml beaker..Create 250 ml of normal water, stir with a glass rod, and heat until the melt elutes with the crucible. Remove the crucible from the beaker, rinse with waters, wash in a individual beaker, continue to rinse the within of the crucible by using 2 ml of 6 mol / L acetic acidity solution, rinse with normal water, and then mix the washings proper beaker. Heat and blend until the melt disintegrates, that beaker is cooled around an ice bath, allowed to stand until the precipitate hardens along with the supernatant is clear, that supernatant is decanted, filtered, and also the fine precipitate is carefully transferred for the filter paper. Dissolve the contents of the beaker twice with chilly sodium carbonate (1 → 50), about 10 ml whenever, stir, as above, continue throughout the same filter paper supernatant, sift, carefully transfer the fine precipitate towards the filter paper, then That large beaker was inserted under the funnel, as well as filter paper was rinsed 5 times with THREE mol / L hydrochloric acid solution solution, 1 ml whenever, and then washed using water (note: the solution may be slightly turbid). 100 ml connected with water, 5 ml connected with hydrochloric acid, 10 ml with acetic acid hinge solution (2 → 5), TWENTY-FIVE ml of potassium dichromate alternative (1 → 10) along with 10 g of urea was added, and the see glass was covered. Following heating for 16 hours, the heat was dried up to constant weight. Filtration, transfer of all precipitates, washing on the precipitate with potassium dichromate option (1 → 200), finally washing with about TWENTY ml of water, drying at 105 ° D for 2 hours, allowing it to cool, weighing, and the resulting precipitate The weight with the object is multiplied by simply 0. 9213. It is a weight of barium sulfate.
[Category] Analysis drugs.
[Storage] sealed and stored.
Barium sulfate (type II)
[identification] consider one.
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