![]() It is demonstrated that these microscopic structures directly affect the solvation for alcohols and phenol in these binary mixed solvents.ĪB - The microscopic structures of acetonitrile-water and DMSO-water binary mixed solvents and their influence on the solvation for solutes (some alcohols and phenol) have been studied on the basis of the cluster structures observed through a specially designed mass spectrometer. In the mixing processes, the water clusters were stabilized in the acetonitrile-water mixtures, whereas the DMSO clusters were stabilized in the DMSO-water mixtures. In acetonitrile-water mixtures, the water clusters were observed at water mole fractions: Xw > 0.2 on the other hand, in DMSO-water mixtures, the water clusters were observed only at much higher water mole fractions: Xw > 0.93. N2 - The microscopic structures of acetonitrile-water and DMSO-water binary mixed solvents and their influence on the solvation for solutes (some alcohols and phenol) have been studied on the basis of the cluster structures observed through a specially designed mass spectrometer. For further information, contact the Drinking Water Program or call 61.T2 - Mass Spectrometric Studies of Acetonitrile-Water and Dimethyl Sulfoxide-Water Binary Mixtures (Part 2) MassDEP has prepared a series of brochures and fact sheets to help you learn more about the water you drink. See "Is there lead in my tap water?", linked below. Because lead can be especially harmful to children, it is important to take the proper steps. As a result, some homes may still have excessive levels of lead at the tap. ![]() Lead pipes were used as water lines in Massachusetts until 1940, and lead solder was used to join copper pipes until the state banned it in 1986. ![]() If you do decide to listen to a sales pitch for bottled water or a filtration unit, remember that it's against the law for anyone other than a state-certified laboratory to test your water for bacteria or chemicals. Before investing in a treatment device or bottled water, try chilling your tap water. Bottled water may taste better than the water that comes out of your tap, but it's a lot more expensive and isn't necessarily "healthier." Home water treatment devices, such as filters, certainly can make tap water taste better-but they also can breed bacteria if they are not properly maintained. ![]() While these substances may affect your water's appearance, smell or taste, they are not harmful to your health. Most often, that is because there has been a heavy algae bloom on the reservoir your water comes from, or excess iron or manganese has accumulated in the lines that deliver it to your home. Tap water sometimes looks, smells or tastes funny. What about bottled water and home water treatment devices? Analytical laboratories can be found in the Yellow Pages. If you use a private well, make sure you have the water sampled and tested periodically. To learn more about where your water comes from, contact your local water supplier. There also are some people whose water comes from private wells, which neither MassDEP nor EPA regulate. In others, it comes from wells that pump groundwater from aquifers. In some communities, drinking water comes from a reservoir that is fed by rivers and streams. If bacteria or chemicals are found in levels that pose a threat to your health, the water supply is treated to remove the contaminants or taken out of service if the problem can't be solved immediately. If testing reveals an exceedance of a federal standard, the water supplier is required to notify customers through local news media. MassDEP requires your local water supplier to perform ongoing tests for the presence of bacteria, lead and other heavy metals, herbicides and pesticides, and industrial solvents. Environmental Protection Agency (EPA) and the Massachusetts Department of Environmental Protection (MassDEP) maintain exacting standards. ![]() The public water supplies in Massachusetts are among the best in the country, and they are subject to the most stringent government standards in the world. Every day, more than six million Bay Staters turn on the tap and take a drink of water from a public water supply. ![]()
0 Comments
Leave a Reply. |