Measurement of heavy metals in a water body environment by utilization of flame atomic absorption spectrophotometry
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A flame atomic absorption and spectrometry technology, which is applied in the measurement of color/spectral characteristics, etc., can solve problems such as human toxicity, and achieve the effect of easy operation.
Inactive Publication Date: 2015-05-06
大连大公检验检测有限公司
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Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as mercury, lead, and sulfide are not necessary for life activities, and all heavy metals are toxic to the human body if they exceed a certain concentration
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Embodiment 1
[0009] Utilize flame atomic absorption spectrometry to measure heavy metals in the water body environment. It is characterized in that, collect the sample to be tested, put the sample into the digestion tank, add 5mL concentrated hydrochloric acid, 5mL hydrofluoric acid, 5mL perchloric acid, mix well, put the digestion tank into Put into the digestion apparatus, digest for 20min, dry and cool, transfer the solution into a 50mL volumetric flask to constant volume, shake well, filter into a colorimetric tube, and use a flame atomic absorption spectrophotometer to compare with a blank sample for analysis. The sample to be tested is collected by taking a water sample and filtering to remove impurities. The method is used to determine the content of zinc, chromium, lead, copper or cadmium in the sample. The standard curve measurement of the method: accurately pipette the heavy metal standard mixed solution with gradient concentration into a volumetric flask, dilute with hydrochloric...
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Abstract
Measurement of heavy metals in a water body environment by utilization of flame atomic absorption spectrophotometry is provided. The measurement is characterized by including: collecting a sample to be measured, putting the sample into a digestion tank, adding 5 mL of concentrated hydrochloric acid, 5 mL of hydrofluoric acid and 5 mL of perchloric acid, mixing uniformly, putting the digestion tank into a digester, digesting for 20 min, drying, cooling, transferring the solution into a volumetric flask having a volume of 50 mL, adding to a constant volume, shaking to obtain a uniform solution, filtering into a colorimetric pipe, and comparing with a blank sample and analyzing by utilization of a flame atomic absorption spectrophotometer. Precision and accuracy of measuring zinc, copper, lead, cadmium and chromium in a polluted water body by the measurement of the heavy metals in the water body environment by utilization of the flame atomic absorption spectrophotometry are high. The relative standard deviation is 104-471%. The measurement is simple and convenient in operation, small in acid using amount and capable of reducing pollution, and is a preferred method for measuring heavy metals in polluted water.
Description
technical field [0001] The invention relates to the technical field of detection of heavy metals in water, in particular to the determination of heavy metals in water environment by means of flame atomic absorption spectrometry. Background technique [0002] Heavy metals refer to metals with a specific gravity greater than 4 or 5. There are about 45 types, such as copper, lead, zinc, iron, diamond, nickel, manganese, mercury, tungsten, aluminum, gold, silver, etc. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as mercury, lead, and sulfur are not necessary for life activities, and all heavy metals are toxic to the human body if they exceed a certain concentration. The heavy metals mentioned in terms of environmental pollution mainly refer to heavy elements with significant biological toxicity such as copper, zinc, sulfur, and lead. Heavy metals cannot be biodegraded, on the contrary, they can b...
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