Low-voltage ion chromatography for simultaneously analyzing silicates and phosphate in water sample
A low-pressure ion chromatography and silicate technology, which is applied in the field of low-pressure ion chromatography for simultaneous analysis of silicate and phosphate in water samples, can solve the problems of high analysis cost and complicated instruments and equipment, and achieve low analysis cost and high instrument efficiency. The effect of simple structure and saving analysis time
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Embodiment 1
[0023] The present embodiment carries out precision measurement by the analysis of standard sample, and the steps are as follows:
[0024] 1. Preparation of silicate-phosphate standard sample
[0025] (1) SiO 3 - Preparation of Si standard sample mother solution
[0026] Na 2 SiF 6 Dry at 105°C for 1 hour, then cool to room temperature in a desiccator. Weigh the dried and cooled Na 2 SiF 6 1. Dissolve 0045g in a 500ml volumetric flask with deionized water, and make it into SiO 3 -Si concentration is 300mg / L mother liquor is protected from light;
[0027] (2)PO 4 - Preparation of P standard sample mother solution
[0028] Dry potassium dihydrogen phosphate at 110-115°C for 1-2 hours, then place it in a desiccator and cool to room temperature. Weigh 1.318g of dried and cooled potassium dihydrogen phosphate, add deionized water to a 1000ml volumetric flask, dissolve and constant volume, and prepare PO 4 -P concentration is the mother liquor of 300mg / L standby;
[002...
Embodiment 2
[0038] The present embodiment measures the working curve of the standard sample, and the steps are as follows:
[0039]1. Preparation of silicate-phosphate standard sample
[0040] (1) SiO 3 - Preparation of Si standard sample mother solution
[0041] SiO 3 -The preparation of Si standard sample mother liquor is identical with embodiment 1.
[0042] (2)PO 4 - Preparation of P standard sample mother solution
[0043] PO 4 The preparation of -P standard sample mother liquor is identical with embodiment 1.
[0044] (3) SiO 3 -Si and PO 4 - Preparation of P standard samples
[0045] Absorb the SiO prepared by a small amount of step (1) respectively 3 -Si standard sample mother liquor and the PO prepared in step (2) 4 -P standard sample mother solution, diluted with deionized water, prepared as follows SiO 3 -Si and PO 4 -P series standard samples:
[0046] PO 4 -P0.120mg / L; SiO 3 -Si 1.40mg / L, PO 4 -P 0.250mg / L; SiO 3 -Si 2.80mg / L, PO 4 -P0.50mg / L; SiO 3 -Si 4....
Embodiment 3
[0054] Present embodiment analyzes silicate and phosphate contained in river water, and the steps are as follows:
[0055] 1. Preparation of eluent E
[0056] Same as Example 2.
[0057] 2. Preparation of chromogenic solution R
[0058] Same as Example 2.
[0059] 3. Test drawing of sample spectrum
[0060] The sample S was operated with the instrument described in Example 1 and the method described in Example 1 to obtain the sample spectrogram.
[0061] 4. Calculation of sample test results
[0062] The spectrogram of the sample S is compared with a series of standard sample spectrograms in Example 2, and the contents of silicate and phosphate in the sample S are calculated according to the working curve of Example 2.
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Abstract
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