Test paper for detecting heavy metal in water and detection method

Abstract

The invention discloses test paper for detecting heavy metal in water and a detection method. The test paper for detecting the heavy metal is obtained by placing quantitative filter paper into a mixed solution, oscillating for 20 to 40 minutes at a constant temperature of 20 to 30 DEG C, taking out the paper and air-drying the paper, wherein the mixed solution is prepared from the following components in parts by weight: 5 to 20 parts of disodium edentate, 3 to 15 parts of ammonia water, 1 to 7 parts of ammonium citrate, 1 to 7 parts of sodium D-isoascorbate, 1 to 5 parts of dimethylglyoxime, 1 to 5 parts of chrome black, 1 to 7 parts of surfactant, 3 to 15 parts of normal butanol, and 20 to 80 parts of water. The detection method comprises the following steps: preparing a sample to be detected into an aqueous solution, and adding an acid solution and a potassium iodide solution to obtain a solution to be detected; dropwise adding the solution to be detected onto the heavy metal detection test paper, and performing the color development for 15 to 200 seconds; and performing the visual comparison for the heavy metal detection test paper and a colourimetric card, and determining the concentration of the heavy metal. The prepared test paper is sensitive in detection, still has color reaction when the content of the heavy metal is lower than the international stipulation, and is higher in detection efficiency.

Description

technical field [0001] The invention relates to the technical field of analysis and detection, in particular to a test paper for detecting heavy metals in water and a detection method thereof. Background technique [0002] The relative density in the physical sense is 4.5g / cm 3 The above metals are called heavy metals. There are 60 natural metal elements with atomic numbers ranging from 23 (V) to 92 (U), of which 54 have a relative density greater than 4.5g / cm 3 , so in the sense of relative density, these 54 metals are all heavy metals. However, when conducting elemental analysis, some of them belong to rare earth metals, and some are classified as refractory metals. Finally, the elements that are actually classified as heavy metals in industry are: copper, lead, zinc, tin, nickel, cobalt, antimony, Mercury, cadmium, and bismuth, these 10 metals are widely used in modern industry. Except for the commonality of metals and the density greater than 5, there is no other spec...

AI Technical Summary

Problems solved by technology

However, when conducting elemental analysis, some of them belong to rare earth metals, and some are classified as refractory metals. Finally, the elements that are actually classified as heavy metals in industry are: copper, lead, zinc, tin, nickel, cobalt, antimony, Mercury, cadmium, and bismuth, these 10 metals are widely used in modern industry. Except for the commonality of metals and the density greater than 5, there is no other special commonality in physics. However, a large number of studies at home and abroad have confirmed that heavy metals have strong biological toxicity. , long-term exposure, causing serious harm to the human body