Determination of Silicate and Borate Contents in Water Using Non-Suppressed Anion Chromatography

The quality of drinking and irrigation water is based on the level of silicate and borate contents present in it. Therefore, regular analysis of silicate and borate contents is essential, especially in freshwater reclaimed from seawater due to the necessity to control the borate levels.

This application note discusses the application of ion chromatography with direct conductivity detection to determine silicate and borate contents as well as some standard anions present in drinking water.

Sample

Drinking water

Sample preparation

None

Columns

Metrosep A Supp 16 - 250/4.0 6.1031.430
Metrosep A Supp 16 Guard/4.0 6.1031.500

Solutions

Eluent 20 mmol/L sodium hydroxide
1.5 mmol/L sodium carbonate

Analysis

Direct conductivity detection

Instrumentation

930 Compact IC Flex/Oven/Deg 2.930.2160
IC Conductivity Detector 2.850.9010
858 Professional Sample Processor 2.858.0020

Parameters

Flow rate 0.8 mL/minutes
Injection volume 250 μL
Pmax 20 MPa
Recording time 30 minutes
Column temperature 45 °C

Results

Anion Conc. [mg/L] RSD [%]
1 Silicate 6.02 1.0
2 Borate n.d. -
3 Chloride 7.89 0.2
4 Nitrate 7.01 2.2
5 Sulfate 5.12 1.3

Concentration in the shown standard solution: fluoride 0.1 mg/L, silicate 0.3 mg/L, borate and chloride 1.0 mg/L

Metrohm AG

About Metrohm

At Metrohm is one of the world’s most trusted manufacturers of high-precision instruments for chemical analysis. Metrohm was founded in 1943 by engineer Bertold Suhner in Herisau, Switzerland. Today, Metrohm is represented in 120 countries by subsidiaries and exclusive distributors. The global Metrohm Group also includes the Dutch companies Metrohm Applikon and Metrohm Autolab, manufacturers of online analyzers and instruments for electrochemical research, respectively. Recently, the Metrohm Group was joined by Metrohm Raman, a leading manufacturer of handheld Raman spectrometers.

Metrohm is the global market leader in analytical instruments for titration. Instruments for ion chromatography, voltammetry, conductivity, and stability measurement make the Metrohm portfolio for ion analysis complete. Instruments for Near-infrared and Raman spectroscopy are another, strongly growing segment of the Metrohm portfolio.

Metrohm is a problem solver, both in the laboratory and within the industrial process. To this end, the company offers their customers complete solutions, including dedicated analytical instrumentation as well as comprehensive application know-how. More than 30% of the company’s employees at the Metrohm international headquarters in Herisau work in R&D.

Metrohm has been owned 100% by the non-profit Metrohm Foundation since 1982. The Metrohm Foundation, which does not exert any influence on the company’s business operations, sponsors gifted students in the natural sciences, supports charitable and philanthropic purposes and, above all, ensures the independence of the company.


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Last updated: Apr 3, 2019 at 3:25 AM

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