Method for detecting concentration of chromium ion in water body

A technology of chromium ion and water body, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of high solubility, poor activity, low absorption rate of animals and plants, etc., and achieve the effect of simple equipment and high accuracy

Inactive Publication Date: 2014-01-29
大连大公检验检测有限公司
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Problems solved by technology

Chromium with a valence of +3 usually exists in the form of trivalent chromium cations. It is one of the essential trace elements for the human body. Its activity is poor, and the absorption rate of animals and plants is very low.
The main physiological function of trivalent chromium is to regulate metabolism and blood sugar metabolism, and is related to the synthesis of nucleic acid esters and cholesterol and the utilization of amino acids; while chromium with a valence of +6 forms an atomic group with an oxygen atom and exists in the form of a chromate anion. With high activity and relatively high solubility, it is easy to cause harm to animals and plants. Long-term exposure to hexavalent chromium compounds will cause skin allergies and ulcers; at the same time, hexavalent chromium has strong oxidizing properties, and it is easy to penetrate human biofilms and interfere with Carrying out of normal redox and hydrolysis processes in the human body

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  • Method for detecting concentration of chromium ion in water body

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Embodiment 1

[0013] A method for detecting the concentration of chromium ions in a water body, the method adopts the following steps:

[0014] (1) Preparation of buffer solution Accurately weigh and dissolve 228.22g of dipotassium hydrogen phosphate trihydrate, put it into a 1L volumetric flask, and add deionized water to make up the volume;

[0015] (2) Preparation of chromogen, weigh 0.1g of diphenylcarbamate, add 30mL of 95% ethanol, then add 200mL of 5% sulfuric acid, and refrigerate;

[0016] (3) Take 0.1, 0.3, 0.5, 0.7, 0.8, 1.0, mL of 5 μg / mL hexavalent chromium standard solution respectively, put them in a 100 mL volumetric flask, add 0.5 mL of phosphoric acid solution, and 1 mL of diphenylcarbophthalein Add water to the scale for color development, and let it stand for 15 minutes, then take the water body to be tested and measure it at a wavelength of 540nm; the concentration of hexavalent chromium ions in the solution=A / k, where A is the absorbance value of the solution; k is the...

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Abstract

The invention discloses a method for detecting the concentration of a chromium ion in a water body. The method comprises the following steps: (1) preparing a buffer liquid; (2) preparing a color developing agent; and (3) drawing a standard liquid curve, adding 0.5mL of a phosphoric acid solution and 1mL of diphenylcarbazide solution again to develop, finally adding water to the scale, stewing for 15 minutes, taking the to-be-determined water body, and determining at the wavelength of 540nm. According to the method for detecting the concentration of the chromium ion in the water body is simple in equipment instrument, is high in precision and accuracy, and is suitable for the water body detection.

Description

technical field [0001] The invention relates to the technical field of water body detection, in particular to a method for detecting chromium ion concentration in water body. Background technique [0002] Chromium is one of the elements existing in the earth's crust, accounting for 0.02wt% of the total amount of the earth's crust, and widely exists in soil, atmospheric water, animals and plants. The 6 valence electrons in the chromium atom can participate in bonding, and the valence states can range from -2 to +6, and the common oxidation states are 0, +2, +3, and +6. Chromium in the environment mainly exists in two forms: inorganic chromium and organic chromium, of which the content of inorganic chromium is much higher than that of organic chromium, and the common valence states are +3 and +6, usually due to the different valence states, resulting in There are significant differences in their chemical properties and levels of toxicity to the human body. Chromium with a va...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 关杰关宇江美玲曹卉王清
Owner 大连大公检验检测有限公司
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