GB/T 4375.3-1984 Methods for chemical analysis of gallium - The chrome azurol S-tetradecylpyridinium bromide spectrophotometric method for the determination of aluminum content

GB/T 4375.3-1984 Method for chemical analysis of gallium - Determination of aluminum content by chrome azurol S-tetradecylpyridinium bromide spectrophotometric method GB/T4375.3-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Methods fot chemical nugysis of gallinnThe chromazarol -twtradecyl pyridibebrnmide photometrle method forthe determlimaliun pf alumniavn contentYou determine, use
UDC668.8T1:545
.42:846,21
GA 4875-3- 84
Standard Zun (4-City Chemical Analysis Bureau Standard General Small General Regulations" 1 method to
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4 analysis steps
accounts for.1 determination integral
weigh the net sample for determination and take the average value. 4.2 sample plate
weigh the sample according to Table 1
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4.8 empty self-test
accompanying the test column to empty the test:
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4.4.1 Place the sample (4.2) in a 50ml beaker, add 1ml nitric acid (2.1) to the surface, place on a ten-inch electric stove to warm for a while, add 5m1 salt (2.2), heat to completely dissolve the sample, cool slightly, rinse with water, and then dry the liquid. Cool, add 1ml acid (2.3), slightly heat to dissolve the salt, and cool. 4.4.2 Collect (4.4.1) into a 100ml separatory funnel, use 10ml hydrochloric acid (2.3) to wash the water by fractional washing method, add the washing liquid into the separatory funnel, add 20ml isocyanate (2.6), shake vigorously for 1min, let stand to separate, pour the water into a 5mm1 beaker, evaporate 1, cool, rinse the ring wall with water and add a small amount of water, slightly heat to dissolve the salt, and cool. Transfer to a 50ml container with water. 4.4.3 Add 1 ml of 2,4-dimethylpyridine ethanol solution (2.7): Use ammonium hydroxide (2.5) to make the solution turn yellow, then add acetic acid (3.4) until the yellow color disappears: Add 5 ml of 1,1 U-dimethylpyridine solution (2.A), add 5 ml of ascorbic acid solution (2.9), stir. Add 7 ml of chromium sulfide solution (2.10), mix. Add 4.5 ml of 1-tetraalkylpyridine bromide (2.11), add 5 ml of acetic acid buffer solution (2.12), mix. Dilute with water to volume, mix. 4.4 Pipette a portion of the solution (4.1.3) into 1 ml of colorimetric solution, and compare it with a white reference of the same choice, and trace its light at 2 m in the spectrophotometer. Find the corresponding amount from the sample. 1.5 Preparation of the working line
4.5.1 Collect 0, 3.20, 0.40, .60-0.80m] standard solution (2,15), respectively, in a 50ml container, dilute with water to about 10ml, and proceed as follows 4.4.3. 4.5.2 Pipette part of the solution (4.5.1) on a 1cm colorimetric plate, take the sample as a reference, and measure its absorbance at 620nm by 1000nm photometry. Draw a working curve with aluminum as the horizontal coordinate and absorbance as the pseudo coordinate. 5 Calculation of the analysis result
Calculate the aluminum content according to the following formula:
Where+-
Allowance difference
GB4875.784
A1(36)
The increase in the sound obtained on the working line is: sample type,.
ma×l0f
The difference between the analysis results of the experimental units should not be too large as shown in Table 2. Table 2
0.0U05 3.6008
0.00D8~0.0UL5
0.0015-0.0C30
2-0. 0030-0.0080
Additional period:
This standard was proposed by China National Nonferrous Metals Industry Corporation.
This standard was drafted by China National Nonferrous Metals Industry Corporation and the main drafter of this standard was Jian Yi.
.3.0008
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