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
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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