How Dangerous Are Detergents?

Dishwashing liquid is very common in our life. It is used in many places, but what are the main hazards of it? Today, I will explain the hazards of washing liquid to you in detail. Commonly used surfactants in dishwashing detergents are sodium linear alkyl benzene sulfonate (abbreviated as LAS) and sodium linear fatty alcohol polyoxyethylene ether sulfate (abbreviated as AES). According to the study on the acute oral toxicity of these two surfactants, the LD50 of LAS was confirmed to be 0.5~2.0 g/kg; the LD50 of AES was 1.7~5.0 g/kg. This toxicity range is comparable to that of edible salt and baking soda, so it should be a non-toxic substance. The concentration of surfactants in detergents is generally only 15~20%, and it is about 0.1~0.15% after being diluted by flushing water. As estimated based on the amount of surfactant remaining in the washing liquid after 1 rinse, the amount of surfactant stained on each plate was only 0.0009 mg. The daily intake is 0.018 mg per person, based on 20 dishes per day; if rinsed twice or rinsed with tap water, the intake is even more insignificant. According to relevant research, the daily intake of surfactants per person is 0.3-3 mg is the safe line. Then, after washing dishes with dishwashing detergent, the residual amount on the dishes is much lower than this line, so it can be regarded as absolutely safe, and consumers can use it with confidence. At the same time, China's mandatory national standard for dishwashing detergents (GB9985-2000) requires arsenic content of 0.05 mg/kg, heavy metals (calculated as lead) 1 mg/kg, methanol 1 mg/kg, and fluorescent whitening agents shall not be detected, etc. , which establishes maximum limits for other potentially hazardous ingredients in dishwashing detergents. If the national standard is strictly implemented, the dishwashing detergent should be normal and harmless. According to the relevant national regulations, formaldehyde cannot be added to detergents. However, some small manufacturers have to use formaldehyde as a preservative to ensure that detergents do not deteriorate due to raw materials, production processes, sanitary conditions, etc. failing to meet the requirements. Therefore, there are two main reasons for formaldehyde exceeding the standard: one is that the quality control of raw materials is not enough, and the other is that some illegal enterprises add formaldehyde in violation of regulations in order to pursue the washing effect. In addition to formaldehyde, methanol is also added to facilitate the dissolution of aqueous and organic phase materials.
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