Accurate ecological detection, building a solid defense line for environmental safety supervision
Environmental monitoring
We focus on the pain points of environmental sample testing such as water quality, soil, and atmosphere, and create an integrated service solution from sample pretreatment, instrument analysis to data output. We adapt to environmental monitoring standards, methods, and regulatory requirements, relying on high-sensitivity detection systems and automated processing platforms to greatly reduce human errors and improve detection efficiency. We can quickly complete qualitative and quantitative analysis of pollutants, trace pollution, and assist environmental monitoring agencies and related enterprises in accurately controlling environmental quality and efficiently implementing ecological and environmental protection supervision tasks.
Polycyclic aromatic hydrocarbons (PAHs) refer to compounds containing two or more benzene ring structures in their molecules. Due to their teratogenic, carcinogenic, mutagenic and biologically non-degradable properties, they are recognized as major organic pollutants affecting human health. PAHs are widely present in soil, air, water bodies and various foods, and most countries have regulations and restrictions on their contents. In order to strictly control the content of PAHs in daily drinking water, the Standards for Drinking Water Quality (GB 5749-2022) in China has set more stringent limit standards for PAHs.
At present, the most widely used detection methods for PAHs are mainly gas chromatography and liquid chromatography. High performance liquid chromatography (HPLC) is the most common due to its good selectivity and high sensitivity, and has become the preferred method for PAH analysis. As PAHs have low solubility in water, in order to determine trace PAHs in water, the pretreatment method specified in GB 5750.8-2023 Standard Test Methods for Drinking Water - Part 8: Organic Matter Indicators uses large-volume water samples for extraction and concentration. However, the pretreatment steps are cumbersome, prone to introduce measurement errors, time-consuming and require large sample volumes, making it difficult to meet the requirements of rapid analysis.
Aiming at the pretreatment challenges in the detection of PAHs in GB 5750.8-2023, Chromai has launched an on-line solid phase extraction system (online-SPE HPLC) combined with ultraviolet/fluorescence detectors, which can efficiently and accurately determine 16 PAHs in water. This solution features high automation, low solvent consumption, high sensitivity and good stability.
At present, the most widely used detection methods for PAHs are mainly gas chromatography and liquid chromatography. High performance liquid chromatography (HPLC) is the most common due to its good selectivity and high sensitivity, and has become the preferred method for PAH analysis. As PAHs have low solubility in water, in order to determine trace PAHs in water, the pretreatment method specified in GB 5750.8-2023 Standard Test Methods for Drinking Water - Part 8: Organic Matter Indicators uses large-volume water samples for extraction and concentration. However, the pretreatment steps are cumbersome, prone to introduce measurement errors, time-consuming and require large sample volumes, making it difficult to meet the requirements of rapid analysis.
Aiming at the pretreatment challenges in the detection of PAHs in GB 5750.8-2023, Chromai has launched an on-line solid phase extraction system (online-SPE HPLC) combined with ultraviolet/fluorescence detectors, which can efficiently and accurately determine 16 PAHs in water. This solution features high automation, low solvent consumption, high sensitivity and good stability.
Conclusion
This study employs the Chromai Leaps on-line solid-phase extraction-high performance liquid chromatography (on-line SPE-HPLC) system combined with ultraviolet and fluorescence detectors to determine trace polycyclic aromatic hydrocarbons (PAHs) in water. Traditional solid-phase extraction involves cumbersome pretreatment steps, high consumption of reagents and consumables, and is prone to significant errors. In contrast, this method utilizes on-line sample concentration and purification, transferring enriched compounds to the analytical flow path via valve switching for quantitative analysis.
The process is simple and easy to operate, with high sensitivity and good stability. The linear correlation coefficients of all 16 PAHs are greater than 0.997, the spiked recovery rates range from 90% to 120%, and the detection limits of all compounds are lower than those specified in GB 5750.8-2023. This method is suitable for rapid and efficient detection of trace PAHs in water.