Method and device applied to detection of toxic metal ions in water

A detection method and metal ion technology, applied in the field of chemistry, can solve the problems of high detection conditions, high equipment price, large size and difficult to carry, etc., and achieve remarkable effects.

Inactive Publication Date: 2015-01-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These technologies are based on high-end scientific equipment and toxicological databases, which have the advantages of accuracy, speed, repetition and efficiency, but at the same time, the equipment is expensive, bulky and difficult to carry, and requires high detection conditions, making it difficult to perform in the wild
For the detection of heavy metal ions in water, a portable heavy metal detector with a mass of about 0.5kg based on electrochemical principles and capable of detecting various heavy metal ions has appeared on the market, but the unit price is as high as 100,000 yuan, and it is difficult to carry out a single person. Equipped and popularized to the family
Since it is inconvenient to carry large and complex specialized detection equipment when working in the field, and most practitioners and residents do not have specialized knowledge, it is necessary to simplify or even eliminate the complicated and cumbersome sample pretreatment process to quickly remove various possible backgrounds It is very important to realize the effective detection and identification of trace target compounds in complex matrices, and to create a portable, low-cost, and popularized rapid detection method and device for toxic metal ions in water sources. practical value

Method used

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  • Method and device applied to detection of toxic metal ions in water
  • Method and device applied to detection of toxic metal ions in water
  • Method and device applied to detection of toxic metal ions in water

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A detection method of toxic metal ions in water according to the present invention, the detection method is to use 1-(2-pyridylazo)-2-naphthol solution as a color developing solution, adding the color developing solution into the water sample to be tested for Color reaction, according to whether the characteristic red color appears in the reaction system, it is qualitatively judged whether the water sample to be tested contains toxic metal ions. If the characteristic red color appears in the reaction system, the water sample to be tested contains toxic metal ions. Toxic metal ions including Cd 2+ , Pb 2+ , Hg 2+ , Mn 2+ 、Ti 3+ , V 3+ 、Co 2+ 、Ni 2+ 、Cu 2+ , Zn 2+ Wait.

[0029] In the present embodiment, 1-(2-pyridylazo)-2-naphthol is a kind of organic chromogenic agent, and its chemical structural formula is as follows figure 1 As shown, it is a commercially available orange-red powder that is slightly soluble in water and easily soluble in organic solvents. ...

Embodiment 2

[0037] Adopt detection method and detection device among the embodiment 1, to the detection test of the toxic metal ion of known accurate concentration:

[0038] Toxicological indicators refer to the indicators of the content of toxic substances that can interfere with normal biochemical processes or physiological functions when entering the body in small doses. According to "GB5749-2006 Hygienic Standard for Drinking Water", the toxicological indicators of several heavy metal ions involved in the present invention are shown in Table 1.

[0039] In the ethanol solution of 1-(2-pyridylazo)-2-naphthol in this example, the mass percentage of 1-(2-pyridylazo)-2-naphthol is 6%. The color reaction is carried out at normal temperature, and the pH value can be in the range of 2-12. The capsule shell of the color-developing capsule 2 is formed by sealing the dropper head 5 of the plastic dropper. The volume of the color-developing gel 2 capsule is 1mL (filled with the color-developing...

Embodiment 3

[0046] Adopt detection method and detection device among the embodiment 1, to the rapid detection test of toxic metal ion in environmental water source:

[0047] Around Changsha, water samples under different environmental conditions were collected with dry and clean mineral water bottles, mainly including: Liuyang River water, Liuyang River factory sewage pipe spigot water, natural pond water, Baisha well water, Yuelu mountain spring water, forest stream water and Moon Lake water , a total of 7 water samples. according to Figure 4 In the operation procedure shown, mix the chromogenic solution with the natural water sample and shake well, and observe the phenomenon. If there is an obvious red color, it is detectable; if there is no obvious red color, it is undetectable. The detection results of each water sample are shown in Table 3. All environmental water samples have no obvious red color, indicating that the concentration of toxic metal ions contained in the seven water s...

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Abstract

The invention discloses a method and a device applied to detection of toxic metal ions in water. The detection method comprises the following steps: taking 1-(2-pyridylazo)-2-naphthol solution as a color rendering solution, adding the color rendering solution into a to-be-detected water sample and carry outing color rendering reaction, and qualitatively judging whether the toxic metal ions exist in the to-be-detected water sample by judging whether the characteristic red color exists in a reaction system, wherein the toxic metal ions comprise one or more of Cd<2+>, Pb<2+>, Hg<2+>, Mn<2+>, Ti<3+>, V<3+>, Co<2+>, Ni<2+>, Cu<2+> and Zn<2+>. The detection device comprises a colorimetric tube with a plug and a color rendering capsule; the color rendering capsule is arranged in the colorimetric tube with the plug and is filled with the color rendering solution. The detection method and the detection device are capable of quickly detecting toxic metal ions in the water, low in cost and simple and convenient to operate.

Description

technical field [0001] The invention belongs to the field of chemistry, and relates to a detection method and a detection device for toxic metal ions in water, in particular to a rapid detection method and detection device for toxic metal ions in water under home or outdoor environmental conditions. Background technique [0002] Water is the source of life. In the field environment, in daily life, there are often reports of poisoning incidents of heavy metal ions caused by man-made poisoning and illegal discharge of factories, such as metal thallium salts and mercury salts. Therefore, on the basis of obtaining water sources, it is particularly important to ensure that water is safe and drinkable. However, often some poisons are not only highly toxic, fast-acting, long-lasting poisonous effect, easy to cause killing concentration after application, and can cause poisoning through various channels, but also difficult to detect and protect, stable in nature, and long-lasting po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 王清华高凯姚海波徐世杰罗京王璟楚增勇李义和
Owner NAT UNIV OF DEFENSE TECH
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