Method for determining trace Co (II) in drinking water

Abstract

The invention discloses a method for determining trace Co (II) in drinking water. The method includes the steps that a series of standard working solutions of the Co (II) are prepared, a main pump collects a Co (II) standard solution or a sample solution R1 to be measured and a buffer solution R2, a reagent R1 enters a chemical block directly, and the buffer solution R2 and a colorimetric solution R3 collected by an auxiliary pump enter a multi-channel sampling valve and also enter the chemical block after being mixed; then, the Co (II) standard solution or the sample solution R1 to be measured, the buffer solution R2 and the colorimetric solution R3 enter a 2 m reaction coil tube, the Co (II) reacts with salicyl fluorone under the existence of CPB, a solution obtained after the reaction enters a spectrophotometer, the light absorption signal value of the reaction system is obtained, and the concentration of the Co (II) is quantitatively calculated according to the peak height; waste liquid is discharged into a special waste liquid collection bottle to be treated, the sample injection process is executed again, another time of analysis begins, and therefore continuous determination analysis is achieved. The method is used for determining the Co (II) in the drinking water, and the recovery rate is 97%-104.3%.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a method for measuring trace Co(II) in drinking water. Background technique [0002] In recent years, food safety issues have attracted great attention, whether it is the problem of excessive heavy metals in food or the intake of trace elements in daily diet. Cobalt is an important environmental element and one of the essential trace elements for human body and plants. In a healthy human body, the content of cobalt is within a certain concentration range, if the content is too high or too low, it will affect the normal metabolism and cause diseases. In the human body, cobalt mainly through the formation of vitamin B 12 to perform biological and physiological functions. Appropriate amount of cobalt can treat infectious anemia and kidney disease. When the human body lacks cobalt, it affects vitamin B 12 The growth and development of red blood cells are disturbed, an...

AI Technical Summary

Problems solved by technology

In the past ten years, cobalt analysis methods have developed rapidly, including spectrophotometry, polarography, chemiluminescence, high performance liquid chromatography (HPLC), inductively coupled plasma emission spectrometry (ICP-AES), inductance Coupled plasma mass spectrometry (ICP-MS), etc. These methods have high sensitivity and accuracy, but they require expensive equipment, tedious and time-consuming operation steps, operators need to have the necessary professional knowledge and skills, and these methods are not suitable On-site analysis, to a certain extent, greatly restricts the application and promotion of these methods

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