What is Xylene and how is it used?

二甲苯是一组非常相似的有机化合物中的任何一种。它们是含有甜味气味的透明液体。二甲苯的最大用途是溶剂，其比苯更安全。其他用途包括：汽油作为BTX组分（苯甲苯二甲苯）的一部分;二甲苯混合物用于制备邻苯二甲酸酯，聚酯纤维，薄膜和制造物品。

下面给出的商品名单可以帮助您了解您是否在家里或工作中使用这种化学品。

Trade Names and Synonyms:

Dimethyl benzene
Xylol.
Methyltoluene
紫罗兰色3.

为什么二甲苯受到监管？

In 1974, Congress passed the Safe Drinking Water Act. This law requires EPA to determine safe levels of chemicals in drinking water which do or may cause health problems. These non-enforceable levels, based solely on possible health risks and exposure, are called Maximum Contaminant Level Goals.

二甲苯的MCLG已经设定为每百万份（PPM），因为EPA认为这种保护水平不会导致下面描述的任何潜在的健康问题。

Based on this MCLG, EPA has set an enforceable standard called a Maximum Contaminant Level (MCL). MCLs are set as close to the MCLGs as possible, considering the ability of public water systems to detect and remove contaminants using suitable treatment technologies.

MCL已设置为10ppm，因为EPA认为，当前技术和资源，这是可以合理地需要水系统去除这种污染物的最低水平，因为它应该发生在饮用水中。金宝搏188dyc

These drinking water standards and the regulations for ensuring these standards are met, are called National Primary Drinking Water Regulations. All public water supplies must abide by these regulations.

What are the Health Effects?

短期：EPA发现二甲苯可能导致当人们在MCL在MCL的水平处暴露于相对较短的时间段时：认知能力，平衡和协调的干扰。

Long-term: Xylenes has the potential to cause the following effects from a lifetime exposure at levels above the MCL: damage to the central nervous system, liver and kidneys.

生产和释放到环境中的二甲苯是多少？

Production of xylenes was 6.84 billion lbs. in 1993. Major environmental releases of xylenes are due to evaporation from the refining and use of petroleum products. It may also be released by leaks or spills during the transport and storage of gasoline and other fuels. Xylenes are a natural products of many plants, and are a component of petroleum and coal tar.

From 1987 to 1993, according to EPA's Toxic Chemical Release Inventory, xylene releases to land and water totaled nearly 4.8 billion lbs. These releases were primarily from petroleum refining industries. The largest releases occurred in Texas. The largest direct releases to water occurred in New Jersey and Georgia.

What happens to Xylene when it is released to the environment?

Most of the xylenes are released into the atmosphere where they are quickly degraded by sunlight. When released to soil or water, xylenes will quickly evaporate. They may leach into ground water and persist there for several years. There is little potential for accumulation in aquatic life.

How will Xylene be Detected in and Removed from My Drinking Water?

The production of xylenes was 6.84 billion lbs. in 1993. Major environmental releases of xylenes are due to evaporation from the refining and use of petroleum products. It may also be released by leaks or spills during the transport and storage of gasoline and other fuels. Xylenes are natural products of many plants, and are a component of petroleum and coal tar.

If contaminant levels are found to be consistently above the MCL, your water supplier must take steps to reduce the amount of xylenes so that it is consistently below that level. The following treatment methods have been approved by EPA for removing xylenes: Granular activated charcoal in combination with Packed Tower Aeration.

How will I know if Xylene is in my drinking water?

如果二甲苯的水平超过MCL，10 ppm，系统必须通过报纸，广播，电视等手段通知公众。可能需要其他行动，例如提供替代饮用水供应，以防止对公共卫生的严重风险。金宝搏188dyc

喝水Standards:

MCLG：10 ppm

Mcl: 10 ppm

Xylene Releases to Water and Land, 1987 to 1993 (in pounds):