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Measurement of anions contained in drinking water.

Measurement of anions contained in drinking water.

Introduction of analysis examples using the Dionex Easion IC system.

Ion chromatography (IC) is a widely accepted method for monitoring inorganic anions present in water, such as surface water, groundwater, drinking water, and wastewater. We present the measurement results of inorganic anions in drinking water using the Thermo Scientific Dionex IonPac AS22 column with the Thermo Scientific Dionex Easion ion chromatography system in the chemical regeneration suppression (DCR) mode.

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  • Analytical Equipment and Devices

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Ion chromatography: Measurement of trace ions in high-concentration basic samples.

Ion chromatography: Measurement of trace ions in high-concentration basic samples.

Measurement of trace anions using inline neutralization processing

The analytical methods for high-concentration sodium hydroxide (NaOH) are specified in JIS K1200 Industrial Sodium Hydroxide Parts 1 to 10. Among these, the methods for measuring chlorides include the mercuric thiocyanate spectrophotometric method, the modified Holthart method, and the ion chromatography analysis method. The mercuric thiocyanate spectrophotometric method is often avoided due to the strict handling and management of mercury compounds. The modified Holthart method quantifies chlorides by adding an excess of silver nitrate solution and performing back titration with ammonium thiocyanate solution, but it is not suitable for quantifying low-concentration chlorides in samples. The ion chromatography analysis method involves complex pretreatment operations and carries the risk of sample contamination; however, this application note introduces a method that automates the pretreatment step using cation exchange resin inline. This automated pretreatment is a technique for inline neutralization using our suppressor technology. It can accommodate not only NaOH but also many high-concentration basic samples, allowing for the analysis of anionic components in the samples.

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Application Data: Positive Ion Measurement by Triethylamine Removal

Application Data: Positive Ion Measurement by Triethylamine Removal

Using the desalt tube "Solnac Tube" for LC/MS! TEA was removed online.

When analyzing highly polar acidic compounds using reverse phase partition chromatography, adding basic ionic species to the eluent can enhance retention by forming neutral ion pairs through ionic bonding. Common basic mobile phases used for ion pair formation in LC/MS include triethylamine (TEA) and dibutylamine (DBA). However, when detecting positive ions, it is believed that ionization suppression occurs with almost 100% probability. In this case, nicotinic acid and uracil acid were used as samples, and TEA in the sample solution was removed using a solid-phase extraction tube for positive ion measurement. For details on conditions and analysis results, please download the catalog. 【Infusion Conditions】 ■Samples: (1) Nicotinic acid 10 ppm solution, (2) Uracil acid 10 ppm solution ■Solvent: CH3CN / H2O = 50 / 50 + 0.1% TEA ■Flow rate: 0.1 ml/min *For more details, please refer to the PDF document or feel free to contact us.

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Application Data: Measurement of Positive Ions by Removal of Dibutylamine

Application Data: Measurement of Positive Ions by Removal of Dibutylamine

Using the desalting tube "Solnac Tube" for LC/MS! DBA was removed online.

When analyzing highly polar acidic compounds using reversed-phase partition chromatography, adding basic ionic species to the eluent can enhance retention by forming neutral ion pairs through ionic bonding. In this case, nicotine acid and uracil acid were used as samples, and DBA in the sample solution was removed using a Sornak tube to conduct positive ion measurements. As a result, it was confirmed that Sornak is effective for LC/MS under mobile phase conditions containing ion pair reagents. For details on conditions and analysis results, please download the catalog. 【Infusion Conditions】 ■Sample: (1) Nicotinic acid 10 ppm solution, (2) Uracil acid 10 ppm solution ■Solvent: CH3CN / H2O = 50 / 50 + 0.1% DBA ■Flow rate: 0.1 ml/min *For more details, please refer to the PDF document or feel free to contact us.

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