Method for detecting potassium salt in cow milk

Abstract

The invention provides a method for detecting a potassium salt in cow milk. The method comprises the following steps of mixing 19.45mL of a disodium hydrogen phosphate solution with a concentration of 0.2mol / L, 0.55mL of a citric acid solution with a concentration of 0.1mol / L and 1.32g of sodium tetraphenylborate, dissolving the mixture by distilled water to obtain 100mL of a sodium tetraphenylborate buffer, taking 5mL of cow milk to be detected, dropwisely adding an acid solution into the cow milk, carrying out mixing to obtain a uniform solution, carrying out centrifugation after condensation, collecting the supernatant A, taking 0.5mL of the supernatant A, adding 0.7mL of the sodium tetraphenylborate buffer into the supernatant A, carrying out mixing to obtain a uniform mixture, carrying out centrifugation, collecting the supernatant B, taking 1mL of the supernatant B, adding 0.3mL of the sodium tetraphenylborate buffer into the supernatant B, carrying out mixing to obtain a uniform mixed solution, carrying out observation, wherein if the mixed solution is clear and transparent, the tested cow milk does not contain the potassium salt, and if the mixed solution produces a lot of white precipitates, the tested cow milk contains the potassium salt. The method can be operated simply and has a low detection cost.

Description

technical field [0001] The invention relates to a method for detecting potassium salt in dairy products, and is especially suitable for detecting potassium salt in milk. Background technique [0002] When buying milk, the dry matter content is an important indicator for identifying the quality of milk, so some people will increase the dry matter content of milk by adding potassium salts to the milk, and then it is possible to add water or other substances to the milk for profit. In order to protect the economic interests of enterprises and the food safety of the people, it is of great economic and social value to measure the content of potassium salt in the process of milk purchase. The existing detection methods for potassium salts in dairy products first need to digest the samples, such as wet digestion, microwave digestion and dry ashing, and then use inductively coupled plasma-atomic emission spectrometry (ICP-AES) and other instruments to The detection is not only time...

AI Technical Summary

Problems solved by technology

The existing detection methods for potassium salts in dairy products first need to digest the samples, such as wet digestion, microwave digestion and dry ashing, and then use inductively coupled plasma-atomic emission spectrometry (ICP-AES) and other instruments to For detection, it not only takes a long time to detect, but also has high requirements for instruments and reagents

These reasons directly lead to the higher cost of milk products, so it is urgent to develop a simple, quick and low-cost milk potassium detection method