The "Hygienic Standards for Drinking Water GB 5749-2023" further tightens the standard requirements for alkylmercury (methylmercury, ethylmercury) in drinking water, clarifying the need to achieve "sub ng level" trace detection accuracy, which poses a severe challenge to the sensitivity, anti-interference and stability of chromatographic columns.

Traditional universal chromatography columns (such as DB-5) are difficult to meet the requirements of the new regulations due to their strong adsorption and high detection limit (>10ng/L)Guangzhou Green Hundred HerbsDirectly suppliedShinwa ULBON HR Thermon HG Alkyl Mercury ColumnWith customized technology design, it has become the core solution for compliance testing of sub NG grade alkylmercury in drinking water.

Although the drinking water matrix is relatively clean, trace amounts of humic acid and minerals may still interfere with the detection of alkylmercury. Traditional columns often have problems such as "unstable low concentration response values" and "peak tailing", resulting in detection data deviating from national standards.

As an authorized agent of Shinwa (Japan Shinwa),Guangzhou Green Hundred HerbsDirectly suppliedShinwa ULBON HR Thermon HG Alkyl Mercury Column Targeted cracking pain points:

Using a special bonded polysiloxane stationary phase, the adsorption loss of alkyl mercury is significantly reduced by blocking active sites, and the detection limit can be stably reduced to 0.5ng/L (sub ng level), far below the standard requirements of GB 5749-2023; The 15m × 0.53mm capillary specification is highly compatible with GC-ECD and GC-CVAFS systems, and can achieve baseline separation with recommended detection conditions (injection port 230 ℃, column temperature 160 ℃). Methylmercury (retention time 2.584min) and ethylmercury (retention time 4.205min) can achieve a separation degree of 3.1 or above.

Experimental data verifies its compliance:

In the concentration range of 0.1-5ng/L (in line with the actual pollution level of drinking water), the standard curve R ² is ≥ 0.999, and the peak area RSD of 6 parallel measurements is less than 3%; For drinking water samples containing trace minerals and humic acid, the recovery rate of alkylmercury remains stable at 90% -103% without any matrix interference. In addition, the lifespan of the column has exceeded 200 injections, and it only requires simple maintenance on a daily basis (cutting off the column head by 1-2cm every 20 injections), which can maintain sub ng level detection accuracy for a long time and reduce the operation and maintenance costs of bulk detection of drinking water.

For water supply enterprises and testing institutions that need to meet the compliance requirements of GB 5749-2023, Shinwa ULBON HR Thermon HG alkylmercury dedicated column has the core advantages of "sub ng level detection limit, high anti-interference ability, and stability and durability", which is suitable for the detection needs of trace alkylmercury in drinking water and provides reliable technical support for compliance standards.