mario

Wednesday, April 9, 2008

How A Home Water Filter Can Reduce Your Child's Risk Of Learning Disabilities

Lead is one of the most dangerous toxins a person can be exposed to in his lifetime. Besides damage from radioactive or nuclear chemicals, significant exposure to lead can cause some of the most severe and even fatal health effects possible.

It seems to be fairly common knowledge that lead is dangerous and that one should avoid exposure to lead whenever possible. Fewer and fewer paints are lead-based and leaded gasoline has been almost entirely phased out. People all over the world are now making concerted efforts to protect themselves from this dangerous metal.

Without doubt, most, if not all, parents would agree that they would like to protect their children from the damaging effects of lead exposure and ingestion. Most parents would also agree that they are doing an adequate job of protecting their children from lead exposure. Still, these same parents (unknowingly) may be exposing and even encouraging their children to take lead into their bodies each and every day.

So, where does this lead come from and why does nobody seem to know about it? The answer to these questions lies in the water we take into our bodies each day. The seemingly safe tap water of most homes in the United States contains lead. When we drink this water untreated, we are consistently allowing lead to poison the inner workings of our bodies.

In most homes built before 1978, lead from lead-soldered pipes in the plumbing system corrodes into drinking water as that water passes through pipes on its way to faucets. From the pipes to the faucet, lead infiltrates our drinking water and makes its way into our bodies and our childrens bodies. Municipal water treatment plants cannot control for this contaminant in water; therefore, lead continues to make its way into our water, with little or no regulation. In order to remove this dangerous contaminant from drinking water, it is absolutely vital to employ a point- of-use water filter.

Clearly, we all know that lead is dangerous and that we should make efforts to avoid it, but what exactly is so very dangerous about lead? It is only a naturally occurring metal, after all, and iron--another naturally occurring metal--is supposed to be good for the body. Lead, however, while dangerous for all people, leads to particularly damaging health and mental problems in babies and young children. Lets first examine the general damaging health effects of lead ingestion and then focus specifically on the results of lead poisoning for babies and small children.

General Health Effects of Lead
Short-term exposure to large amounts of lead has been known to cause severe vomiting, cramping, convulsions, coma, and even death. While such exposure is increasingly unlikely in todays world, even relatively low-level exposure to lead can cause some significant health problems. Lead is a leading cause of anemia, a syndrome that affects more than 3.5 million people in the United States. Continued exposure to lead can also affect nervous system functioning, resulting in impairment of mental functioning, difficulty in memory and concentration, and inability to sleep. A lifetime of exposure to lead can adversely affect kidney functioning. Lead poisoning is also a leading cause of high blood pressure, one of the current deadliest conditions for individuals in the United States. Consistently rising numbers of high blood pressure and anemia cases--syndromes that have not traditionally been connected to lead poisoning--should certainly be considered when discussing the role of lead ingestion on the body.

Effects of Lead Poisoning on Babies and Young Children
Lead is especially damaging to babies and small children, due to the relative ease at which their bodies absorb the contaminant and the sensitive nature of their developing brains. Concerning the impact of lead poisoning on children, the U. S. Environmental Protection Agency recently stated, Childhood lead poisoning remains a major environmental health problem in the U.S.. According to the Centers for Disease Control and Prevention, approximately one out of every 22 children has high levels of lead in his blood.

Lead poisoning gives rise to several damaging health conditions in young childrens developing bodies. The younger the child is, the more damaging lead poisoning can be. The long-term effects of exposure to lead for young children include learning disabilities, hyperactivity, depressed growth, hearing impairments, and even brain damage.

For pregnant women, ingestion of lead can result in a host of birth defects and developmental problems for their growing babies. Ingestion of lead is particularly harmful to babies during the critical third trimester of pregnancy. Lead can pass into a babys body through breast-feeding, as well.

Diagnoses of hyperactivity and learning disabilities are growing by leaps and bounds in public schools, perhaps because of so much unknowing exposure to lead and increasing cases of lead poisoning.

What You Can Do
Knowing what we do about lead and its effects on our children and ourselves, what can we do to prevent exposure to this dangerous metal? There are several approaches--all of them important--that you can take now to protect yourself and your family. Firstly, it is important to keep your home clean and dust-free because much of your childs exposure to lead comes from dirt and dust on the floor. It is also incredibly important to have your child tested for lead poisoning if you suspect or notice any of the symptoms. With early treatment, many of these problems can be quickly alleviated.

It is also absolutely vital to begin, or continue using, a home water filtration system. Untreated tap water is likely the culprit of the majority of you and your childs exposure to lead. A simple home water filter can remove lead quickly and easily to ensure that you and your family are protected from the volatile, dangerous nature of this metal.

Every parent wants to give her children every opportunity possible to succeed; taking a few minutes to provide clean, healthy water to drink is one of the best and easiest ways to accomplish this goal.

Vanessa Lausch is a writer for http://www.historyofwaterfilters.com/ - online source for water information.

Bikram Yoga Books Motilal

Reversing Mother Nature-Part One

Blossom is what underground uranium miners called the crystals forming on the tunnel walls. Because the ore was in contact with air inside an underground mine, and as ground water moved slowly against the mines walls, a visible crust of uranium crystals would precipitate, or blossom along those walls. Making the uranium soluble doesnt require a lot of oxygen and water because oxidization is a natural process. Adding more oxygen to the groundwater found in, and around, a uranium-mineralized orebody is the principle upon which present-day In Situ Leach (ISL) uranium mining is based.

Eons ago, the uranium was soluble and moved, on or below the surface, with the ground water. In roll front uranium deposits the uranium was transported into the area through the natural groundwater system and precipitated from solution due to some reducing environment, explained Harry Anthony, Chief Operating Officer of Uranium Energy Corp. Often, the reducing agent was something organic, such as coal, deep-seated oil and gas deposits, or hydrogen sulfide gases. In its reduced form, the uranium crystals are insoluble. It will precipitate as a coating on the existing sand grains of the sandstone, added Anthony. As more water containing uranium sweeps through this area, and encounters this reducing environment, more uranium is precipitated until there is a sufficient concentration to make it a commercial deposit.

After the geological team has delineated a companys uranium roll front deposit and determined it is of economic value, the company must turn to its ISL design engineers to complete the mining process. While it takes stellar geologists such as David Miller of Strathmore Minerals, Bill Sheriff of Energy Metals, or William Boberg of UR-Energy to accumulate large, proven uranium-mineralized holdings, as they have done in Wyoming, New Mexico, Texas or elsewhere, each must turn to their engineers to extract the uranium from those sand grains and process them to produce an economic quantity of uranium oxide, or U3O8. The overwhelming majority of ISL facilities, designed in the United States, were engineered by Harry Anthony, Doug Norris and Dennis Stover.

Trained as a mechanical engineer, Harry Anthony has been involved with more than ten ISL uranium operations from Union Carbides Palangana in 1976 to Uranium Resources Bruni, Benavides, North Platte, Kingsville Dome and Rosita ISL projects. Anthonys consulting work has taken him to ISL projects in Kazakhstan, Uzbekistan and the Czech Republic. Dennis Stover is best remembered for designing Smith Ranch in Wyoming, now owned by Cameco Corp. With a PhD in chemical engineering from the University of Michigan, Dr. Stover helped develop the first commercial alkaline ISL project in south Texas for Atlantic Richfield and helped develop an additional five small ISL operations in south Texas. Also a chemical engineer by training, Doug Norriss paths have crossed with both Stover and Anthony. He helped build the Highland and Smith Ranch ISL operations in Wyoming, and designed Mestenas Alta Mesa ISL operation in south Texas.

HOW DOES ISL MINING REVERSE MOTHER NATURE?

In its natural, reduced environment, uranium exists as a solid in the +4 valence, Anthony explained. In the mining stage, we are reversing Mother Natures process by adding oxygen, oxidizing the uranium from a valence of +4 to a valence of +6. The uranium was oxidized at one time, but then reduced by Mother Nature. By drilling wells into the ore zone, circulating the water and adding oxygen to it, the uranium is made soluble again.

Is it really this simple? Yes and no. Energy Metals Chief Operating Officer Dennis Stover outlined the process, Youre simply adding, into the injection well, gaseous oxygen, just pure oxygen, but youre doing it under the water level in the well. The natural pressure, created by that column of water above the injection point, allows the oxygen to dissolve into the water so that theres no free gas being put into the well.

Stover compared the oxygen dissolved in the liquid to the carbon dioxide dissolved in a bottle of soda. The soda remains clear, dissolved in the liquid, when stationery. But when you shake it up, the gas will break out, added Stover. The pressure thats available that lets you dissolve the oxygen is determined by the amount of naturally occurring water pressure thats on the uranium deposit. Stover explained that if the deposit is 100 feet below the water table, you can dissolve a certain amount of oxygen. If the uranium deposit is 200 feet below the water table, or twice as deep, you can dissolve twice as much oxygen.

Historically, ISL mining evolved from acid leaching to leaching with sodium bicarbonate or sodium carbonate. Most people add only carbon dioxide in dissolved oxygen at this point, Stover explained. Theres a chemical relationship between carbon dioxide gas, bicarbonate, and the carbonate ion. The host rock typically contains calcium carbonate or sodium carbonate minerals. By adding the carbon dioxide, Stover said, It will lower the PH of the solution just slightly. That enhances the solubility of the naturally occurring calcium carbonate. According to Stover and the other experts, the addition of carbon dioxide is an effective replacement for the previously added bicarbonate ion.

The goal is to get the uranium out of the sandstone and soluble. Were accelerating Mother Nature and making the uranium soluble again, said Doug Norris, engineering manager for Uranium Energy. When its soluble, we can just pump it out of the ground. But it is dissolved in the water like salt in sea water. You cant see it, but its there.

MINING THE URANIUM

ISL mining and processing the uranium is a very simple process. Its a water treatment plant with hundreds of water wells. There are two types of wells: injection and production. The water plus reagent (oxygen, carbon dioxide) is injected into the ground via water wells. Outside the United States, where environmental regulations may be less restrictive, an ISLs aquifer may be bombarded with harsh acid leaching. On Harry Anthonys engineering services website, he describes the process he observed in the Czech Republic, Over 4,100,000 tons of H2SO4 (sulfuric acid), 270,000 tons of HNO3 (nitric acid), 100,000 tons of NH3 (ammonia), and 25,000 tons of HF (hydrofloric acid) were consumed by the mine.

It would be nearly impossible to get an ISL project permitted in the United States using these chemicals to leach the uranium. The water quality division, within a states Department of Environmental Quality (DQE), demands restoration to background, which is about where the groundwater was before ISL mining began. The less things you add, the less you have to reclaim at the end of the process, Doug Norris pointed out. The more stuff you add trying to get it out of the ground, the more you have to clean up.

Dennis Stover explained how the fluids presently used came about, Historically, most ISL operations had a great deal of difficulty with plugging or fouling of their injection wells due to the precipitation of excessive amounts of salts. He pointed out that the chemistry miners were using in conventional milling operations didnt work in ISL mining. Because they had very high concentrated salt solutions, they were trying to accelerate everything, Stover told us. When you take those concentrated solutions and put them underground, Mother Nature is not always happy. Other salts that were present in the rock would dissolve, solutions would become supersaturated and they would precipitate out. The wells would plug up.

Norris explained that sometimes you have to add a carbonate source, such as carbon dioxide to stabilize the dissolved uranium as uranyl dicarbonate. Norris said, The uranium is in a solid state in the ore, as Mother Nature left it. We oxidize it and turn it into uranyl dicarbonate. What goes to the processing plant is called lixiviate, the dissolved uranium in its ionic form. According to Anthony, Today, most ISL mining operates at neutral pH, and the uranium is complexed as a dicarbonate.

Water is circulated through the injection wells with the expressed purpose of separating the uranium coating the sandstone. Each time you circulate the water through the orebody, you are capturing some of the uranium. Each pass through is called a pore volume. Its like filling up a bucket of sand with water, explained Anthony. Once you have the bucket full of sand, you can still pour in water. The amount of water you can pour in until you just bring it up to the top of the sand is termed a pore volume. Pore volume is the interspatial volume.

In Anthonys models for operating an economic ISL plant, he calculates 20 pore volumes (PV). Porosity, or the spaces in between the sand particles, where the water can travel (permeability), helps determine how much uranium can be recovered. It takes about 20 PV to 30PV to recover the highest percentage, said David Miller, who was Cogemas chief ISL geologist in the United States, before becoming President of Strathmore Minerals. But, as the price of uranium keeps going higher, it may be economic to recover a higher percentage of the orebody. Maybe 40PV to 50PV will be possible with the direction the prices are moving. Of course, your average processed grade will go down. A few years ago, you would want to shut wells off at 15 parts per million (ppm), but now you might want to run them at 10ppm. At $50/pound uranium, you may be able to run at 7 or 8ppm.

Typically, an ISL operation should recover about 70 percent of the uranium in the ore, under the 20PV to 30PV scenario. However, in the case of the Czech Republics Diamo project, once Europes largest uranium mining operation, only 55 percent was recovered. Clearly, the more uranium recovered with the least number of pore volumes, the lower the operating costs. Trying to recover more uranium is only possible if you have the plant capacity. Because of the rising price of uranium, we would expect more companies to attempt to recover a higher percentage of uranium. Miller warns, however, You will not make your production quota if your plant is sized at a certain gallons per minutes at a certain grade to meet your annual production. If you lower the average grade and fail to increase your flow rate, your annual production will decrease.

James Finch contributes to StockInterview.com and other publications. StockInterviews Investing in the Great Uranium Bull Market has become the most popular book ever published for uranium mining stock investors. Visit http://www.stockinterview.com

Yoga Foam Blocks 3

Mar 31, 2008 Apr 1, 2008 Apr 2, 2008 Apr 3, 2008 Apr 4, 2008 Apr 5, 2008 Apr 6, 2008 Apr 7, 2008 Apr 9, 2008 Apr 10, 2008 Apr 11, 2008 Apr 12, 2008 Apr 13, 2008 Apr 14, 2008 Apr 15, 2008 Apr 16, 2008 Apr 17, 2008 Apr 18, 2008 Apr 19, 2008 Apr 20, 2008 Apr 21, 2008 Apr 22, 2008 Apr 23, 2008 Apr 24, 2008 Apr 25, 2008 Apr 26, 2008 Apr 27, 2008 Apr 28, 2008 Apr 29, 2008 Apr 30, 2008 May 1, 2008 May 2, 2008 May 3, 2008 May 6, 2008 May 7, 2008 May 8, 2008 May 9, 2008 May 10, 2008 May 11, 2008 May 12, 2008 May 15, 2008 May 17, 2008 May 22, 2008 May 28, 2008 Jun 1, 2008 Jun 4, 2008 Jun 5, 2008 Jun 6, 2008 Jun 8, 2008 Jun 9, 2008 Jun 11, 2008 Jun 13, 2008 Jun 14, 2008 Jun 16, 2008 Jun 17, 2008 Jun 19, 2008 Jun 21, 2008 Jun 22, 2008 Jun 23, 2008 Jun 25, 2008 Jun 28, 2008 Jun 29, 2008 Jul 2, 2008 Jul 3, 2008 Jul 8, 2008 Jul 11, 2008 Jul 12, 2008 Jul 14, 2008 Jul 17, 2008 Jul 20, 2008 Aug 3, 2008 Aug 5, 2008 Aug 7, 2008 Aug 8, 2008 Aug 9, 2008 Aug 11, 2008 Aug 14, 2008 Aug 15, 2008 Aug 16, 2008 Aug 17, 2008 Aug 19, 2008 Aug 21, 2008 Aug 22, 2008 Aug 26, 2008