High-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions

A test method and high-sensitivity technology, applied in the field of ion chromatography analysis, can solve problems such as low sensitivity, high detection limit, and difficult determination, and achieve the effect of wide range of measurement objects and low detection limit

Inactive Publication Date: 2011-07-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conductometric detectors are versatile, but have low sensitivity and high detection limits, especially for easily polarizable anions such as Br - , I - , S 2 o 3 2- etc.), because these ions are prone to redox reactions, the detection

Method used

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  • High-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions
  • High-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 1. Sample preparation

[0012] Formation CL - , NO 2 - , Br - , NO 3 - , SO 4 2- I - S 2 O 3 2- Mixed solution, CL - The concentration is 2 μm, and the remaining ions concentration is 1 μm, NA with 9mm: 1mm 2 CO 3 Yu Nahco 3 The hybrid solution is the gonorrhea.

[0013] 2. Sample analysis

[0014] Use a 10ml syringe to absorb 10ml of the above solution, inject the Dian IC-1500 ion color spectrometer, the anion protection column and analysis column models are Dionex IonPac AG9-HC (4mm I.D. × 50mm) and Dionex IonPac AS9-HC (4mm I.D. × 250mm)., Gonoring solution is 9mm: 1mm NA 2 CO 3 With Nahco 3 The hybrid solution, the flow rate is 0.9ml / min, the inlet quantitative ring is 1 / 16 in the outer diameter, the inner diameter is 0.030 in, and the length of 7m is a PEEK tube.The temperature is 28-32 ° C.

[0015] Example analysis of this embodiment is attached figure 1 Show, the peak time of each ion is as follows:

[0016] CL - -7.67min, NO 2 - -8.33min, br - -9.39 min, no 3 ...

Embodiment 2

[0018] Formulating a series of concentrations contains CL - , NO 2 - , Br - , NO 3 - , SO 4 2- I - S 2 O 3 2- The mixed solution, the ion concentration in each solution is shown in Table 1,

[0019] Table 1 The concentration of a series of hybrid solutions

[0020] Hybrid standard solution serial number

[0021] The above 6 mixed solutions are injected into the Dian IC-1500 ion color spectrometer in turn. The posterior ions protective column and analysis column models are Dionex IonPac AG9-HC (4mm I.D. × 50mm) and Dionex IonPac AS9-HC (4mm I.D. × 250mm)., Gonoring solution is 9mm: 1mm NA 2 CO 3 With Nahco 3 The mixed solution, the quantitative ring inlet quantitative ring is 1 / 16 in, 0.030 in inner diameter, 7m with a length of 7m, the control flow rate is 0.9ml / min, the inhibitor is Dionex ASRS 300, the inhibitory current is 88mA, the pillar mild detectionThe temperature of the pool is 28 ~ 32 ℃.Each solution is repeatedly measured twice, and its average value is tak...

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Abstract

The invention relates to a high-sensitivity testing method capable of simultaneously implementing measurement of multiple negative ions. The analysis objects not only comprise Cl<->, NO2<->, NO3<-> and SO4<2->, but also comprise easily polarized ions Br<->, I<-> and S2O3<2->. A negative ion analysis column AS9-HC and a protection column AG9-HC are adopted together, the washing solution comprises Na2CO3 and NaHCO3 in a concentration ratio of 9mm: 1mm, the flow rate of the washing solution is 0.9 to 1.1ml/min, the detector is an electrical conductivity detector, the current of a suppressor is 88mA, the temperature of the columns and the temperature of a detection cell are 28 to 32 DEG C, and the used quantitative ring is a polyether-ether-ketone (PEEK) tube with inside diameter of 0.030in, outside diameter of 1/16in and length of 7m. The lower detection limits of the ions are low and reach nano scale, namely the lower detection limit of Cl<-> is 0.61 nanometer, the lower detection limit of the NO2<-> is 0.94 nanometer, the lower detection limit of the NO3<-> is 0.93 nanometer, the lower detection limit of the SO4<2-> is 0.81 nanometer, the lower detection limit of the Br<-> is 0.90 nanometer, the lower detection limit of the I<-> is 2.48 nanometers and the lower detection limit of the S2O3<2-> is 1.84 nanometers. The method is simple and convenient for operation, and can be used for implementing high-sensitivity measurement of multiple negative ions indoors or outdoors.

Description

Technical field [0001] The present invention is an ion chromatography analysis technology, which specifically involves a high -sensitivity test method that can realize a variety of anion measurement in water at the same time.It can be used for indoor or field -to -sea, groundwater, industrial wastewater, hot spring water and other samples (CL - , NO 2 - , NO 3 - , SO 4 2- , Br - I - S 2 O 3 2- ) Analysis. Background technique [0002] In nature, water, seawater, groundwater, industrial wastewater and other water bodies contain different types of anion of different types and concentrations, including CLs with stable properties - , NO 2 - , NO 3 - , SO 4 2- And easy polarization, prone oxidation reaction br - I - S 2 O 3 2- The classic wet chemical analysis can only be determined by different chemical methods, and it has shortcomings such as interference, long time, and low sensitivity. [0003] The ion chromatography is suitable for analysis of multiple anion in the sample...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 王虎任德章周怀阳
Owner TONGJI UNIV
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