Modified nano SiO2 water quality processor turbidity standard substance and preparation method thereof
A water quality processor and turbidity technology, which is used in the field of standard material preparation to achieve good dilution characteristics, reduce force, and prevent agglomeration.
Pending Publication Date: 2021-02-05
SHANDONG INST FOR PROD QUALITY INSPECTION
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Problems solved by technology
In the prior art, there is no relevant record of modifying silica as a turbidity-marking substance for water quality processors
Method used
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Embodiment 1
[0041] Weigh 2g nano-SiO2 Dissolve in 60mL absolute ethanol, ultrasonically oscillate for 60min and then magnetically stir for 1h. 4.324g 3-chloropropyltrimethoxysilane was added to the dispersed nano-SiO 2 In the ethanol solution, react in a constant temperature water bath at 85°C for 0.5 h, then add 2 mL of 3 % volume concentration of hydrochloric acid, continue to react for 3.5 h, stir continuously during the reaction, after the reaction, centrifuge for 15 min, wash with absolute ethanol for 3 Second-rate. Dry in a vacuum oven at 55 °C for 8 h, grind into powder, and weigh an appropriate amount of modified nano-SiO 2 Powder, add tertiary water, ultrasonically disperse for 1 h, and prepare a spiked stock solution with a certain turbidity of about 400 NTU.
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Abstract
The invention belongs to the technical field of the preparation of standard substances, and relates to a turbidity standard substance for a modified nano SiO2 water quality processor and a preparationmethod of the turbidity standard substance. The standard substance is modified nano SiO2 subjected to modification treatment, the SiO2 is spherical particles, and the average particle size of the SiO2 is 100-500 nm. According to the invention, modification is carried out under the synergistic effect of 3-chloropropyltrimethoxysilane and hydrochloric acid, so that the acting force between hydroxylgroups on the surface of nano SiO2 is reduced, a clear particle surface is formed, the agglomeration of nano SiO2 is prevented, and the standing stability is good. The concentration and turbidity ofthe modified nano SiO2 solution prepared by the method have a good linear relationship, and the modified nano SiO2 solution has the characteristic of serving as the turbidity standard substance of thewater quality processor. And modified nano SiO2 aqueous solutions with different particle sizes can be prepared according to the requirements of filter elements with different precisions, and the particle size controllability is good. The modified nano SiO2 solution prepared by the method has no influence on water quality oxygen consumption and pH value.
Description
technical field [0001] The invention belongs to the technical field of preparation of standard substances, in particular to a modified nano-SiO 2 A water quality processor turbidity standard substance and a preparation method thereof. Background technique [0002] Turbidity is an important physical index used to characterize the turbidity of water quality. Turbidity in source water is due to optically scattering or absorbing behavior of suspended matter or colloidal matter, or both. Household and similar water purification devices can eliminate the threat of surface water pollution, tap water disinfection by-products and secondary pollution of water pipelines to residents' drinking water. In order to standardize the inspection of products related to drinking water sanitation and safety and strengthen the supervision and management of the quality of water quality processors, the Ministry of Health formulated the "Ministry of Health Inspection Regulations on Drinking Water S...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01N1/28G01N33/18
CPCG01N1/28G01N33/18G01N2001/2893
Inventor 官杰高翠玲贺祥珂彭晓辉范红梅
Owner SHANDONG INST FOR PROD QUALITY INSPECTION
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