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CN-121978256-A - Method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography

CN121978256ACN 121978256 ACN121978256 ACN 121978256ACN-121978256-A

Abstract

The invention relates to a method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography, belonging to the technical field of analysis and test. According to the invention, specific order treatment is carried out on medical wastewater, and gradient elution ion chromatography is adopted, so that interference substances such as microorganisms, suspended matters, heavy metals, organic matters, chloride ions and the like in the medical wastewater are effectively removed, and the accuracy and sensitivity of detection of bromide ions and iodide ions are remarkably improved. Meanwhile, the method is simple and quick to operate, can realize simultaneous determination of bromide ions and iodide ions in the medical wastewater, and provides reliable technical support for effective treatment and environment monitoring of the medical wastewater. In addition, by establishing a standard curve, the concentration of bromide ions and iodide ions in the water sample to be detected can be accurately calculated, and a new pollutant index basis is provided for medical wastewater quality evaluation.

Inventors

  • WANG JUAN
  • ZHANG LIPING
  • HE SU
  • Feng Lanhui
  • SHEN SHUOGUO
  • ZHANG YINTAO
  • HUANG JIE
  • Shao Yuexin
  • WANG YIXIAO
  • ZHANG LULU

Assignees

  • 黄河水利委员会洛阳水文水资源勘测局
  • 河南省地质局地质灾害防治中心

Dates

Publication Date
20260505
Application Date
20260409

Claims (10)

  1. 1. A method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography, which is characterized by comprising the following steps: (1) Medical wastewater is subjected to flocculation treatment, residual chlorine removal treatment, filtration treatment, heavy metal removal treatment and organic matter removal treatment in sequence to obtain a water sample to be detected; (2) Preparing a mixed standard solution of bromide ions and iodide ions, and establishing a standard curve of the bromide ions and the iodide ions by a gradient elution ion chromatography; (3) Setting a gradient elution program, and injecting the water sample to be detected into an ion chromatograph for ion chromatographic analysis to obtain the peak area of bromide ions and the peak area of iodide ions; (4) And respectively calculating the concentration of the bromide ion and the concentration of the iodide ion according to the standard curve and the peak area of the bromide ion and the peak area of the iodide ion.
  2. 2. The method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography according to claim 1, wherein in the step (1), the flocculation treatment is to sequentially add a chitosan flocculant and a cationic polyacrylamide flocculant to medical wastewater for treatment.
  3. 3. The method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography according to claim 2 is characterized in that the chitosan flocculant is prepared by adding chitosan into acetic acid solution and stirring for 2-4 h to obtain the chitosan flocculant.
  4. 4. The method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography according to claim 2, wherein the cationic polyacrylamide flocculant is prepared by adding cationic polyacrylamide into water, stirring for 1-2 h, and standing for 0.5-1 h to obtain the cationic polyacrylamide flocculant.
  5. 5. The method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography according to claim 2, wherein the volume ratio of the medical wastewater to the chitosan flocculant is 200:10-200:30.
  6. 6. The method for simultaneously measuring bromide and iodide ions in medical wastewater based on ion chromatography according to claim 1, wherein in the step (1), the residual chlorine removal treatment is to add Na 2 S 2 O 3 to the wastewater after flocculation treatment.
  7. 7. The method for simultaneously measuring bromide and iodide ions in medical wastewater based on ion chromatography according to claim 6, wherein the concentration of Na 2 S 2 O 3 in the wastewater is 3.0-4.0 g/L.
  8. 8. The method for simultaneous determination of bromide and iodide ions in medical wastewater based on ion chromatography according to claim 1, wherein in the step (1), the filtration treatment is a filtration membrane treatment with a pore size of 0.22 μm; the heavy metal removal treatment is to sequentially treat the filtered wastewater by a Na-type cation exchange column and an H-type cation exchange column; The organic matter removing treatment is that the wastewater is treated by a C18 solid phase extraction column or an RP solid phase extraction column.
  9. 9. The method for simultaneously measuring bromide and iodide in medical wastewater based on ion chromatography according to claim 1, wherein in the step (3), the eluent in the ion chromatography is potassium hydroxide solution, the flow rate is 1.00mL/min, the column temperature is 30.0 ℃, the conductivity cell temperature is 35.0 ℃, the whole-process fixed suppressor current is 99mA, and the sample injection amount is 200 μl.
  10. 10. The method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography according to claim 9, wherein the eluting time is 0-12 min, the concentration of eluent is 15mmol/L, the concentration of eluent is increased from 15mmol/L to 40mmol/L at 12-12.1 min, the concentration of eluent is 40mmol/L at 12.1-28 min, and the concentration of eluent is controlled to 15mmol/L at 28-34 min.

Description

Method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography Technical Field The invention relates to the technical field of analysis and test, in particular to a method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography. Background Medical wastewater is one of the sewage sources in urban environments, and the influence and harm of the discharge of the medical wastewater to the water ecological environment are not very small, so that the medical wastewater has become an important factor for endangering human life and health, and compared with industrial wastewater, the medical wastewater has larger harm. Medical wastewater contains a certain amount of bromide and iodide. The iodide is mainly derived from iodine contrast agent used in diagnosis process, radioactive waste liquid of nuclear medicine department, excrement generated after patient takes radioactive isotope in diagnosis and treatment process, cleaning water generated by cleaning cup, injector, pipette and other vessels during split charging of high-intensity radioactive isotope. The bromide in the medical wastewater mainly comes from the waste liquid of the phase washing chamber, the disinfectant, part of drug metabolites and the like. If the medical wastewater containing bromide and iodide is directly discharged into a natural water body, the medical wastewater can cause harm to water environment and human health. Meanwhile, bromide and iodide are one of new pollutant indexes for medical wastewater quality evaluation. Therefore, the bromide and iodide in the medical wastewater can be rapidly and accurately measured to protect, monitor and treat the environment, the safety of drinking water is ensured, and the effective treatment of the medical wastewater is important. At present, the detection methods of bromide at home and abroad mainly include an X-ray fluorescence spectrometry, a spectrophotometry, a potentiometry, a voltammetry, an ion chromatography, a gas chromatography and an iodometry, and the detection methods of iodide mainly include a capacity method (hypochlorite method), a spectrophotometry, an ion chromatography, a liquid chromatography, a gas chromatography, an electrochemical method, a flame atomic absorption method, an ICP-AES method, an ICP-MS method, a neutron activation method, a flow injection fluorescence extinction analysis method and the like. Because the ion chromatography has the characteristics of short analysis time, high sensitivity, good selectivity, good stability, small environmental pollution and the like, the method is widely applied to the fields of petrochemical industry, environmental monitoring, food and medicine, solid waste, hydrogeology, electronic and electric appliances, sanitation and epidemic prevention and the like, and is particularly important for pretreatment of samples because of complex components of medical wastewater and interference of a plurality of components on determination of bromide and iodide. The main components of the medical wastewater comprise microorganisms, chlorides, suspended matters, ammonia ions, animal and vegetable oils, anionic surfactants, volatile phenols, total cyanide, heavy metals such as cadmium, chromium, lead, silver, mercury and the like. Wherein microorganisms, suspended matters, heavy metals, organic matters and chloride ions have certain interference on the determination of bromide and iodide. Disclosure of Invention In view of the above analysis, the present invention aims to provide a method for simultaneously determining bromide and iodide in medical wastewater based on ion chromatography, which is used for solving at least one of the problems that the prior art does not disclose a method for testing bromide and iodide in medical wastewater, and the existing methods for testing bromide and iodide in other wastewater are not applicable to medical wastewater detection, and have low efficiency, low sensitivity, unreliable results, high cost and the like. In order to achieve the above purpose, the present invention adopts the following technical scheme: A method for simultaneously measuring bromide ions and iodide ions in medical wastewater based on ion chromatography, which comprises the following steps: (1) Medical wastewater is subjected to flocculation treatment, residual chlorine removal treatment, filtration treatment, heavy metal removal treatment and organic matter removal treatment in sequence to obtain a water sample to be detected; (2) Preparing a mixed standard solution of bromide ions and iodide ions, and establishing a standard curve of the bromide ions and the iodide ions by a gradient elution ion chromatography; (3) Setting a gradient elution program, and injecting the water sample to be detected into an ion chromatograph for ion chromatographic analysis to obtain the peak area of bromide ions and the peak area of iodide ions; (4) And res