A kind of polymer suspension turbidity standard substance and preparation method thereof

Abstract

The invention discloses a polymer suspension turbidity standard substance and a preparing method thereof. Nano particles with high-density negative or positive charges on the surfaces are dispersed into deionized water and a bacteriostatic agent is added to prepare polymer suspension, and the concentration is adjusted to obtain polymer turbidity standard liquid of which the turbidity value is 400NTU. The polymer turbidity standard liquid of which the turbidity value is 400 NTU and zero-turbidity water are diluted proportionally to obtain the polymer suspension turbidity standard substance ofwhich the nominal value is 0.5-100 NTU. The polymer suspension turbidity standard substance has the advantages of having the low turbidity value smaller than or equal to 100 NTU, being high in stability, free of cold storage, convenient to transport and use, and capable of being stored at the normal temperature, and having a stable period as long as 2 years.

Description

technical field [0001] The invention belongs to the technical field of standard substance preparation, and relates to a polymer suspension turbidity standard substance and a preparation method thereof. Background technique [0002] Turbidity is the degree of turbidity of a transparent medium. In water quality monitoring, food and beverage, sanitation and epidemic prevention, medicine, energy and other industries, the amount of insoluble suspended particulate matter contained in water is limited, and the main technical parameter indicating the amount is turbidity. A turbidimeter is an instrument used to measure turbidity. The turbidity meter needs calibration before leaving the factory, regular verification is required during use, calibration curves need to be drawn during on-site measurement, and turbidity standard substances are required as measurement standards for the assessment and comparison of turbidity measurement levels between different laboratories in the same ind...

AI Technical Summary

Problems solved by technology

Formazine turbidity standard solution needs to be protected from light, refrigerated storage, transportation and use conditions are harsh, easy to degrade, and poor stability

The synthetic raw material hydrazine sulfate is highly toxic, and hexamethylenetetramine is carcinogenic, which is very harmful to the human body.

In addition, Formazine still has the following shortcomings as a turbidity measurement standard: (1) The shape of suspended particles is irregular, and the particle size and distribution are not easy to control; (2) Formazine is an uneven suspension system, and due to the large particle size, the sedimentation speed is fast , after standing for a period of time, the particles will settle and form a huge difference in concentration; (3) Formazine is an unstable suspension system, which needs to be shaken well when used, and the turbidity value is obviously affected by human factors; (4) in the presence of The value during storage is variable and the stability is not good, especially when the turbidity is low (≤100NTU), the repeatability is not good and the stability is extremely poor, so it must be used and prepared immediately

However, the turbidity standard solution still needs to be stored in the refrigerator, and its stability is poor, and it can only be stable for 3 months

Patent CN 105571914A (a kind of turbidity standard solution and preparation method thereof) discloses a kind of nano-titanium dioxide turbidity standard solution, but it is an inorganic type turbidity standard solution, and the turbidity value is high (200, 500 and 1000NTU), Poor stability (can be stored at room temperature for 30 days), needs to be prepared immediately

[0005] With the rapid development of science and technology, turbidity measurement is developing towards low turbidity and high precision. Formazine turbidity standard solution can no longer meet the needs of industrial production and scientific research in the field of low turbidity measurement.

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