Method for measuring bromate content in drinking water

A technology of bromate and drinking water, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low detection limit and low accuracy of detection results, improve sensitivity and accuracy, and solve the problem of inaccurate detection results high effect

Pending Publication Date: 2022-07-29
GONGBEI CUSTOMS TECH CENT
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a method for determining the content of bromate in drinking water, so as to establish a detection

Method used

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  • Method for measuring bromate content in drinking water
  • Method for measuring bromate content in drinking water
  • Method for measuring bromate content in drinking water

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1: Influence of different ways of removing chloride ions on the effect of removing chloride ions in water samples

[0032] In this embodiment, the method of concentrating the water sample is the direct heating method, and the specific operation is as follows: take the water sample in a clean beaker, and place the beaker directly on the electric furnace to concentrate the water sample.

[0033] In order to select a suitable way of removing chloride ions, in this embodiment, the water samples that pass through the silver solid-phase extraction column and then are concentrated and enriched for bromate ions, the water samples that are first concentrated and enriched with bromate ions and then passed through the silver solid-phase extraction column, and The water samples that cannot be concentrated on the silver solid-phase extraction column are analyzed by ion chromatography. The water samples that cannot be concentrated on the silver solid-phase extraction column ar...

Example Embodiment

[0034] Example 2: Influence of different concentration multiples on the recovery rate of water samples

[0035] According to the experimental results in Example 1, the pretreatment of the water sample in this example adopts the method of first concentrating the water sample and then passing through a silver solid-phase extraction column to remove chloride ions in the water sample. On the basis of directly heating the concentrated water sample, this example determines the appropriate concentration ratio by studying the relationship between the multiple of the concentrated water sample and the recovery rate of bromate of the measured substance.

[0036] The specific operation of this example is as follows: take 12 clean beakers and divide them into two groups, 6 in each group, add 50 mL of water samples to each group, and add 2.5 mL of BrO to 3 of the water samples. 3 - Standard solution (100 μg / L), the remaining 3 water samples were used as blank samples, this group of water s...

Example Embodiment

[0039] Example 3: Calculation of method detection limit and quantification limit and its accuracy evaluation

[0040] Based on the experimental results of Example 2, this example adopts the following pretreatment method for the water sample with low bromate content: first, it is directly heated and concentrated for 5 times and then passed through a silver solid phase extraction column to remove chloride ions in the water sample.

[0041] The pretreated water samples with low bromate content were injected into the ion exchange chromatograph for analysis, and the experiment was repeated 7 times in parallel. The test results are shown in Table 2. Calculate the standard deviation S based on the actual concentration of bromate in the water sample, and the standard deviation S can be obtained as 0.080. The detection limit MDL is calculated according to the following formula (1),

[0042] MDL=t(6,0.99)·S (1)

[0043] Among them, the value of t in the formula is 3.143, which is a on...

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Abstract

The invention provides a method for measuring the content of bromate in drinking water, which comprises the following steps: S1, pretreatment of a water sample: concentrating the water sample, and then removing chloride ions in the concentrated water sample by using a silver solid-phase extraction column; s2, sample introduction analysis: filtering the water sample pretreated in S1, introducing the filtered water sample into an ion exchange chromatograph for detection, and substituting a detection result into the standard curve to determine the content of bromate. The detection method for the bromate in the drinking water, which is higher in sensitivity and lower in detection limit, is established, and the problem of low accuracy of a detection result of a detection method for the bromate in the drinking water in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of bromate content detection, in particular to a method for measuring bromate content in drinking water. Background technique [0002] Ozone disinfection technology is a relatively advanced and safe method among the current drinking water disinfection methods, but studies have shown that ozone will produce bromate with bromide in water during the disinfection process of drinking water, and bromate is recognized as 2B internationally. The World Health Organization's "Water Quality Standards for Drinking Water" and my country's current "Drinking Water Hygiene Standards" stipulate that the limit of bromate is 10μg / L. [0003] At present, the determination methods of bromate content in drinking water mainly include ion chromatography, high performance liquid chromatography, capillary electrophoresis-electrochemical detection method. Among them, ion chromatography is widely used due to its advantages of rapidity, simplicit...

Claims

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Application Information

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IPC IPC(8): G01N30/96G01N30/06
CPCG01N30/96G01N30/06
Inventor 曾俊洁蔡德玲潘亮曾文祥彭碧宁陈舒畅邹蓝吴佩珊
Owner GONGBEI CUSTOMS TECH CENT
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