On-line Dialysis-Double Suppressed Ion Chromatography Determination of Seven Ions in Water Samples
A technology of ion chromatography and water samples, applied in the field of analytical chemistry, can solve many problems, and achieve the effect of simple operation and short time
Active Publication Date: 2020-10-30
SOUTHERN MEDICAL UNIVERSITY
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Embodiment 1
[0071] Step 1: Drawing of mixed standard curve
[0072] Pipette standard solutions of fluoride ions, chlorite ions, nitrite ions, bromide ions, chlorate ions, nitrate ions, and sulfate ions into 50mL volumetric flasks respectively, and make to volume to prepare a mixed standard working solution. F respectively - , SO 4 2- 0.2, 0.5, 1, 5, 10, 20, 40mg / L, ClO 2 - , NO 2 - 、Br - , ClO 3 - , NO 3 - 0.2,0.4,1,2,5,10,20mg / L. Under the set working conditions of the instrument, samples are injected sequentially from low concentration to high concentration, and the standard working curve is drawn with the ion concentration mg / L as the abscissa and the corresponding chromatographic peak area μS / min as the ordinate.
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Abstract
The invention discloses a method for determining seven types of ions in a water sample by dialysis-double inhibition ion chromatography. The water sample is detected in a device by using a Metrosep ASupp 7 chromatographic column for detection and a sodium carbonate and isopropanol mixed solution as an eluent, and carrying out separating at the flow velocity of 0.6-1.0mL / min. Thus, the seven typesof anions in the water sample can be detected at the same time, operation is simple, and detection can be completed within half an hour; the resolution of each type of ion is greater than 1.5; the linear range of F- and SO42- is between 0.20 and 40.0 mg / L, the linear range of ClO2-, NO2-, Br-, ClO3- and NO3- is between 0.20 and 10.0mg / L, the detect limit of the seven types of ions is between 1.50and 12.0mg, and the detection limit of the method is between 3.00 and 24.0mg / L; and the standard added recovery rate of all samples is between 83% and 116%, and the relative standard deviation of therecovery rate is lower than 5%.
Description
technical field [0001] The invention relates to the field of analytical chemistry, in particular to a method for determining seven ions in water samples by ion chromatography. Background technique [0002] Water is one of the environmental media that human beings rely on for survival, accounting for about 70% of the earth's surface, and plays a pivotal role in all human production and life. The earth's natural water resources are mainly divided into three categories, namely precipitation, surface water, and groundwater. According to current research, substances contained in natural water include dissolved substances (salts and compounds such as calcium, magnesium, and sodium), colloidal substances (humus, silica gel), and suspended substances (clay, bacteria, and algae). [0003] Surface water is the water body formed by the runoff and collection of precipitation on the surface, including river water, lake water, pond, reservoir water, etc. The main components are easily a...
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IPC IPC(8): G01N30/88
CPCG01N30/88G01N2030/8868
Inventor 沈梅周美娟王颖
Owner SOUTHERN MEDICAL UNIVERSITY