Pre-treatment of Semi-Volatile Organic Compouds (SVOCs) product

Volatile Organic Compounds (VOCs)

Volatile Organic Compounds (VOCs) refer to organic compounds that have a high vapor pressure (greater than 13.33 Pa), low boiling point, and small molecular weight under standard conditions, making them easily volatile at room temperature.

These substances are major atmospheric pollutants and are commonly denoted as VOC or VOCs, representing a class of organic compounds with similar physical and chemical properties. Most volatile organic compounds have unpleasant odors and exhibit toxicity, irritancy, teratogenicity, and carcinogenicity. Notably, compounds such as benzene, toluene, and formaldehyde can cause significant harm to human health.

Compared to volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs) are more challenging to degrade and persist longer in the environment.

Semi-volatile organic compounds (SVOCs)

Semi-volatile organic compounds (SVOCs) generally refer to a large class of compounds characterized by lower volatility, water insolubility, solubility in organic solvents, boiling points between 170-350°C, and vapor pressures between 10⁻⁷-0.1 mmHg.

These compounds are mostly oily liquids that can persist in the environment—air, water, soil—over long periods, have the potential for long-distance transport, and exhibit toxicity and bioaccumulative properties. Major categories include dioxins, polycyclic aromatic hydrocarbons (PAHs), organic pesticides, chlorobenzenes, polychlorinated biphenyls (PCBs), pyridines, quinolines, nitrobenzenes, phthalates, nitrosamines, anilines, phenols, polychlorinated naphthalenes, and polybrominated biphenyls. SVOCs originate from various sources, are difficult to degrade, highly adsorptive, and commonly found indoors.

Volatile compounds don't scare me, but semi-volatile ones do?

Semi-volatile organic compounds (SVOCs) also negatively impact the reproductive and genetic systems, making it essential for people to take them seriously.

How are semi-volatile organic compounds (SVOCs) detected?

The process mainly involves sampling, extraction, purification, and measurement. Today, we'll focus on sample purification.

Choosing appropriate pre-treatment products based on the sample matrix and the physical properties of the target compounds is highly beneficial for subsequent testing. Solid-phase extraction (SPE) cartridges are commonly used for sample purification to remove interfering components from the extract. Additionally, QuEChERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) purification tubes provide a more rapid and convenient method for sample pre-treatment.

PAEs

Polychlorinated biphenyl

Nitrobenzene

Organochloride