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N2L-P-,5000011 <br /> appropriate som pUng plan of MIL-TD-105, the lot represented by the sample • <br /> shall be rejected. <br /> 4.4.2 Lot acceptance tests. The samples taken as specified in 4.3.2 <br /> shall be subjected to the tests specified in 4.5. Failure of the samples <br /> to comply with any of the tests specified herein shall reject the Iot or <br /> batch. <br /> 4.4.3 Inspection methods. Chemical analysis shall be wade in accordance <br /> with the tests specified in 4.5 or by any applicable standard quantitative <br /> method including spectrographic analysis to determine conformance to the <br /> chemical requirements of 3.2 and 3.3. In case of dispute, chemical analysis <br /> by the methods detailed herein shall be the basis for acceptance. Unless <br /> otherwise specified, the chemical values specified in tables I, II and III <br /> shall apply to the average of determinations made on the products. <br /> 4.5 Test procedures. Distilled water and analytical reagent grade chemi- <br /> cals shall be used throughout the tests. Where applicable, blank determina- <br /> tions shall be run and corrections applied. <br /> 4.5.1 Test solution preparation. Weigh out exactly 25 grams of the phos- <br /> phating compound to be tested and transfer it to a 250 milliliter volumetric <br /> flask. Fill to the nark with water. Mix the solution thoroughly. This <br /> solution (0.1 gram sample per milliliter) is used in all tests, unless other- <br /> vise specified in the individual test. <br /> 4.5.2 Phosphate determination. The percent phosphate (PO4) shall be <br /> determined as follows: <br /> 4.5.2.1 Preparation of annonius molybdate reagent. Mix 55 grams of a=20- <br /> ai-= unlybdate and 50 grams of amonium nitrate with 18 ml. of concentrated <br /> ammonias hydroxide and 20 ml. of water. Stir, dilute to 700 ml. with water <br /> and hest for 30 minutes with occasional stirring until all salts have dis- <br /> solved. Dilute to one liter, let stand overnight and filter. <br /> 4.5.2.2 Test procedure. Pipette 10 ml. of the dilute test solution (see <br /> 4.5.1) into a 100 Ml. volumetric flask and fill to the ma-k with distilled <br /> eater. Mix thoroughly and pipette 15 ml. into a 150 al. beaker. Add 45 ml. <br /> of sister, 15 ml. of concentrated nitric acid and 6 grass ammonium nitrate. <br /> Stir thorouSbly and filter into a 250 ml. beaker. Seat the solution to <br /> exactly 80'e (176'F) and add 75 al. of ammonium molybdate reagent with rapid <br /> stirring. Continue stirring for several minutes and allow to cool. When <br /> the precipitate has settled, filter through a weighed, fritted glass crucible <br /> of medius pososity, having a nominal maxlsun pore diameter of 10-15 microns, <br /> and Wash with 1 percent nitric acid. Dry the crucible for 1-1/2 hours at <br /> 1.05 t 5'C (221 t 90F), cool in a desiccator and weigh. Calculate the percent <br /> phosphate as follows: <br /> 6 <br /> 2464 <br />