2013年5月15日 星期三

Offers alternatives to toxic lifestyle

There is no doubt that chemistry has brought us many of the modern wonders we enjoy, from plastics and epoxies to pharmaceuticals, to batteries, to cancer treatment, to innovative consumer products, to lightweight fuel-efficient aircraft.

But chemistry has a downside. Health studies have linked many industrial chemicals to cancer,Modern dry cleaning machine uses non-water-based solvents to remove soil and stains from clothes. neurological damage, endocrine disruption, birth defects, asthma, and other health problems. Adults alive today have in their bloodstream measureable amounts of over 200 industrial chemicals. Do we know the effects of these substances? Hardly. Only a small fraction of commonly used chemicals have been studied for their effects on health, and the interactions of various substances are even less understood. Even so, the pace of development is accelerating, with new substances introduced daily.

Many people assume that chemicals are routinely tested for their safety; most are not. True, laws like the Emergency Planning and Community Right-to-Know Act (EPCRA) and the Toxic Release Inventory (TRI) require reporting of industrial emissions of hazardous substances, and OSHA mandates compliance with worker exposure limits on toxic substances. But determining the toxic effects of substances is a complex process that can take decades and millions of research dollars.A letter folding machine is a piece of equipment which is designed to fold paper.Six panel tracking system delivers more energy from skystream. Even after extensive study, results can be controversial, leading to further delays in adopting policy. Thus formaldehyde, a known carcinogen and asthma trigger, remains a common component in building materials, fertilizers and beauty products from which it off-gasses and is inhaled. Though one of the most studied substances in existence, formaldehyde was only designated a High Hazard Substance last year.

More complicated are substances like n-Propyl Bromide, a solvent used in glues and paints, which was recently highlighted in a “New York Times” article for its neuro-toxic effects on furniture workers. Or, take Bisphenol-A (BPA), one of the earliest developed so-called “plasticizers” that make plastics pliable and easily handled. Used as a thin lining inside food cans and as an additive in plastics used for everything from beverage bottles to baby toys, BPA has been suspected as an endocrine disruptor that can alter maturation development in infants and children. BPA has been in the news for this, but studies raising concern about it are controversial within the scientific community. Meanwhile product makers, wishing to advertise “BPA-free” are substituting other substances about which little is known.

Fortunately, the news is not all discouraging. Chemists are beginning to embrace the new discipline of “Green Chemistry,Books can be as thick as 4 inches and yet the Book scanner 9000 delivers flat.” whose principles dictate that health and environmental safety are considered in the development of new substances. California recently adopted the recommendations of a Green Ribbon Chemistry panel regarding the chemical makeup of products sold in the state. Exciting new research is finding safer alternatives to the toxic status quo. For example,All Continental flatwork ironer offer easy-to-operate controls that provide efficient performance and flexibility. researchers at UMass Lowell have developed bio-based alternatives to toxic isocyanates used in adhesives, and surfactants derived from cashew shells to replace hazardous surfactants in detergents. Dry cleaners have started converting from dry cleaning based on Perc, a carcinogenic petroleum solvent, to ‘wet’ cleaning, based on less toxic water-based surfactants that clean fine garments just as well.

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