美国环境保护署(EPA)在2009年9月曾表示，它正在考虑制定104种新增化学物质在自来水中的安全标准，包括杀虫剂、日用品、消毒副产品，并首次把药品纳入考虑范围。
EPA in September said it was considering regulating 104 additional chemicals in tap water, including pesticides, commercial chemicals, disinfection byproducts, and for the first time, pharmaceuticals.
而注表面活性剂和聚合物的复配体系段塞后热水驱虽然提高采收率幅度较大，但吨油新增成本较高，经济上不合理。
The surfactant and polymer mixed system slug is well on recovery ratio but the additional cost of ton oil is higher, economic benefit is not satisfactory.
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