DLA A-A-59456-1999 FERRIC CHLORIDE ANHYDROUS CRYSTALLINE TECHNICAL《工业水晶无水氯化铁》.pdf
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1、A-A-5445b Sai 9018054 0011134 727 Requirement Water insolubles, as Fe,O, , Percent by weight Minimum Maximum - 4.0 METRIC A-A-59456 18 June 1999 SUPERSEDING 25 February 1975 MIL-F-1458OC COMMERCIAL ITEM DESCRIPTION FERRIC CHLORIDE, ANHYDROUS, CRYSTALLINE, TECHNICAL The General Services Administratio
2、n has authorized the use of this commercial item description for all federal agencies. 1. SCOPE. This commercial item description (CID) covers one technical grade of crystalline anhydrous ferric chloride. It is intended for use in water purification. 2. SALIENT CHARACTERISTICS 2.1 Chemical compositi
3、on. The anhydrous ferric chloride shall conform to table I when tested as follows: TABLE I. Chemical composition. Ferrous chloride (FeCl,) - Ferric chloride FeC1,) I 95.5 Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data which may improve this document sh
4、ould be sent by letter to: Defense Supply Center Richmond (DSCR), ATTN: DSCR-VBD, 8000 Jefferson Davis Highway, Richmond, VA 23297-56 1 O. AMSC N/A DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. FSC 68 1 O Provided by IHSNot for ResaleNo reproduction or networking
5、permitted without license from IHS-,-,-A-A-5945b 111 9018054 0011135 663 5 A-A-59456 2.1.1. Water insolubles. Without undue exposure to air, transfer 4 to 5 grams of ferric chloride to a tared weighing bottle, using a clean paper funnel to prevent ferric chloride from coming in contact with the grou
6、nd joint. Stopper the bottle immediately, and reweigh the bottle and contents. Wash the specimen into a 500 milliliter (mL) volumetric flask with water, cool to approximately 25 OC, and fill the bottle to the mark with water and shake by hand. Allow the contents to settle for about 10 minutes and th
7、en vacuum filter approximately 425 mL of the solution through a tared Gooch crucible, containing an acid-washed asbestos pad, into a dry vacuum flask. Remove the flask containing the filtrate and save the filtrate for succeeding analyses. Replace the vacuum flask with another vacuum flask and filter
8、 the remaining solution. Wash the flask with water and add washings to the Gooch crucible. Repeat the washing procedure six times, allowing the filter to pull dry between each washing. Wash the precipitate once with ethyl alcohol. Dry the crucible and precipitate for 30 minutes at 100 OC, heat for 1
9、5 minutes at 600 OC, cool in a desiccator to room temperature, and reweigh. All weighings shall be to the nearest milligram (mg). Calculate the percent water insolubles as follows: Percent water insolubles = 1 O0 A B Where A = Weight of precipitate (weight of crucible with asbestos pad and precipita
10、te minus weight crucible with asbestos pad), and B = Weight of sample (weight of weighing bottle and sample minus weight of weighing bottle). 2.1.2 Ferrous chloride (FeCl,). A sample of the filtrate from 2.1.1 shall have the percentage of ferrous chloride determined 6 accordance with the procedures
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