Preparation and usage method of water quality heavy metal detection agent
A technology of heavy metals and detection agents, applied in the field of analysis and detection, can solve the problems of undiscovered solid detection agents, etc., and achieve the effects of convenient transportation, high sensitivity and simple operation
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Embodiment 1
[0018] A water quality heavy metal detection agent is prepared.
[0019] Take by weighing 20g potassium thiocyanate, 2g potassium hydroxide and 2g polyvinylpyrrolidone respectively, after mixing them, grind them uniformly to obtain heavy metal detection powder A; then weigh 6 mg of 4-(2-pyridylazo) m-benzene Diphenol, 10g ammonium fluoride, 10g ammonium sulfate, first dissolve 4-(2-pyridylazo) resorcinol in 5ml of absolute ethanol, then mix with ammonium sulfate and ammonium fluoride, and keep the temperature at 60°C Dry in an oven for 2 hours, grind evenly after cooling, and obtain heavy metal detection powder B.
[0020] The aforementioned potassium thiocyanate, potassium hydroxide, 4-(2-pyridylazo)resorcinol, ammonium fluoride, ammonium sulfate, polyvinylpyrrolidone and absolute ethanol are commercially available analytically pure chemicals.
Embodiment 2
[0022] The heavy metal detection agent obtained in Example 1 of the present invention was used to measure the concentration of heavy metals in seawater.
[0023] In 5 test tubes each equipped with 10ml seawater, add 0.2g of the heavy metal detection powder A prepared in Example 1 respectively, after shaking and dissolving, then add 0.2g of the heavy metal detection powder B prepared in Example 1, shake and dissolve, Stand still for 10 minutes, use a spectrophotometer to measure the absorbance at a wavelength of 510nm, and substitute it into the heavy metal standard curve to calculate the heavy metal concentration. The results of the five measurements are: 0.085, 0.092, 0.095, 0.088, 0.104 mg / L, and the relative standard deviation is 8%. , which is consistent with the detection result of ICP-AES method of 0.092mg / L, therefore, the detection agent is accurate and reliable in determining the concentration of heavy metals.
Embodiment 3
[0025] The heavy metal detection agent that adopts embodiment 1 of the present invention to obtain is measured certain mining and metallurgy wastewater heavy metal
[0026] After a certain mining wastewater is filtered through filter paper, take 1.00ml into a glass test tube, add water to dilute to 10ml, add 0.2g of the heavy metal detection powder prepared in Example 1, shake to dissolve, then add 0.2g of Example 1 to prepare The heavy metal detection powder B was shaken and dissolved, and left to stand for 10 minutes. The absorbance was measured at a wavelength of 510nm by a spectrophotometer, and substituted into the heavy metal standard curve to calculate the concentration of heavy metals in the mining wastewater: 6.29mg / L, which was compared with the ICP-AES method The test result of 6.13 mg / L is basically the same. Therefore, the detection reagent is accurate and reliable in determining the total amount of heavy metals in industrial wastewater.
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