Bioavailability Of Lead: Negative Effects On Human Health

The lead in the environment is formed naturally in the earth’s crust mainly as Lead Sulphide. The main exposure channels of lead entering the environment through atmospheric lead is predominantly from automobile emissions. Other lead exposure routes include lead-acid batteries, paint chips, fertilizers, utilized ammunition, pesticides, and other industrial byproducts. The means of conveying lead from key emission sources is mainly through the air. Concerning the sources of lead in drinking water, normally lead reaches into the residents’ water after it is channeled from their water treatment plant or the wells. To be more precise, the source of lead in people’s water supply largely emanates from their households’ pipes or lead solder from plumbing. The most typical cause of the lead formation is from the corrosion reaction by the lead pipes or solders and the water. The acidity as a result of the low pH, dissolved oxygen, and little mineral contents in the water are main reasons of the corrosion. The lead amounts in the water become high if the water spends a long duration of time stagnated inside the old pipes.

All the inhabitants of Flint communities regardless of their location had irreversible, permanent brain damage due to lead-contaminated water. It started when traces of E. coli and total coliform were found in the Flint River. The city addressed this problem by increasing chlorine levels in the water, causing the pipes to corrode, releasing lead into the waters. Total trihalomethanes (TTHM) were also formed in the water (they are carcinogenic to humans).TTHM is a disinfection byproduct that occur when chlorine interacts with organic matter in the water. At this stage, The lead levels in the water was 13,200 ppb. Water is considered hazardous waste at 5,000ppb (NPR 2016). This tragedy goes to show that this toxic runoff, or even the miss-handling of the water resources in a watershed can affect everyone as the downstream water was piped up into the upstream communities.

In this day and age consumers always want more and they want it at the lowest price possible, but are they willing to risk the danger that could derive from it? Hundreds of thousands of toys are imported daily from overseas countries, such as China, into the United States, some toys are inspected for irregularities, but most are not. This may not seem like such a problem but the truth of the matter is that it is one of the larger problems in the nation right now. Children’s toys imported from China are found to be contaminated with high levels of lead and infecting American children with lead poisoning. Some people may say that this is an unnecessary argument, that China isn’t doing anything harmful, maybe it was just a few faulty toys,

The lead effects in the drinking water have caused a massive public health crisis (“Scientific Opinion on the risks”, 2015). The whole crisis was as a result of poor management practices employed in the Flint water plant. The city decided to switch the

Lead poisoning has been a concern for many years. In fact, because of the affects of lead poisoning, there has been an extensive decline in its use. "Many people believe lead poisoning is no longer a threat, yet millions of homes contain lead based paint" (Heck, J., 2005, para. 1). Exposure to lead at any level is unhealthy, especially in infants, children, and pregnant women and continues to be an ongoing dilemma in this country. I read two articles concerning lead poisoning; the first article is from FineTuning, a popular press and the second article is from Pediatrics, a peer-review journal. In this paper, I will clearly summarize each article by comparing the content of both articles. In addition, I will summarize the attention to

Potential lead contamination from drinking water presents a significant health risk. Recent examples of this lead contamination include Flint, Michigan, a city that experienced a large increase in the number of people, especially children, who exhibited symptoms of lead poisoning. A March 9, 2016 article in the Washington Post reported data from the Environmental Protection Agency that indicated approximately 350 schools and day-care centers across the US failed lead tests approximately 470 times between 2012 and 2015. Seven years ago, according to the Post, a study concluded that hundreds of young children in Washington, DC, had potentially damaging amounts of lead in their blood due to contamination in the city’s tap water. The toxin can cause permanent developmental and behavioral issues.

In Flint Michigan, nearly 100,000 residents are drinking lead contaminated water. (QuickFacts). We are not discussing a third world country on the other side of the globe, but rather a city in the United States. It would seem as though the land of opportunity, and the land many flee too should be able to provide clean drinking water. However, in the United States 310,000 children aged 1-5 are found with an unsafe level of lead running through their blood stream. (Lead 8). In Flint alone, 8,000 children under the age of six have been exposed to harmful levels of lead. The agencies and government that was put into place to protect the public from these issues is often turning a blind eye, and often allowing the public to continue to drink this contaminated water. A major part of the problem is that lead water pipes run throughout cities across the United States. Although it would very expensive to replace all the water pipes running through Flint, not replacing the pipes could potentially continue to do more harm to the ecosystems, and to the communities they are in. (rst2)

When the contamination in Flint’s water system was noticed, it was because of the “smell, taste, and color.” (The Humanist 23) The water pipes were deteriorating because of the polluted water, which was causing lead to flow into the water. People immediately started complaining to their city’s mayor about the changes in the water. Soon after that, scientists from Virginia Tech discovered it was severe lead in the water. Lead poison is known to destroy or affect almost every organ or system in someone’s body. (The Humanist 23)

At the age of just a year old, Reginald Cureton, a Detroit middle schooler, was just a year old, a blood test proved he had four times the level of lead in his blood that was concluded as lead poisoning. His parents were baffled and doctors said it would alter his brain development and hinder his skills as a child. Reginald's elementary school suggested numerous times that he repeat the third grade. This lead his parents to do test him for any mental stagnancies and he was diagnosed with ADHD. Now in middle school, Reginald and his family's fight against lead- exposure is continued and as strong as ever as they are taking extra precautions to reduce his lead exposure in any way possible (Lead-Exposure Problems Spotlighted in Detroit) . Unfortunately

This peer pressure lead drinking may require the supportive nature of a peer pressure group

The improved screening and treatment of lead poisoning decreased the severity of symptoms usually seen. However, the level of lead in the blood does not establish what symptoms are seen, since lead in blood only establishes current exposure. Recently, studies have shown that a long exposure to low amounts of lead may have severe neurobehavioral effects that are not diagnosed until the child enters school (Singhal et. al., 1980).

He had been working in same site as case 1, however irregularly more than 12 weeks. His blood lead was 4.09 µmol l−1 (85.2 µg 100 ml−1). On examination sickliness was noted however he was generally well and displayed no neurological or scholarly weakness. Examination appeared: Hb 9.7 g 100 ml−1 with direct polychromatic and basophilic stippling of the red cells. His blood number was generally inside ordinary points of confinement similar to his electrolytes and liver capacity tests. He got a 19 day course of succimer by mouth as above, yet no sodium calcium edetate. At survey 4 weeks after the fact his indications had settled and his Hb was 11.3 g 100 ml−1. Other applicable discoveries show up

In 2000, WHO assessed the global burden of disease due to a number of risk factors associated with lead. (3)

* Lead. Lead is hazardous to health as it accumulates in the body and affects the central nervous system. Children and pregnant women are most at risk.

Native lead is rare in nature. Currently lead is usually found in ore with zinc, silver and copper and it is extracted together with these metals. Lead occurs naturally in the environment. However, most lead concentrations that are found in the environment are a result of human activities. Due to the application of lead in gasoline an unnatural lead-cycle has consisted. In car engines lead is burned, so that lead salts (chlorines, bromines, oxides) will originate. These lead salts enter the environment through the exhausts of cars. The larger particles will drop to the ground immediately and pollute soils or surface waters, the smaller particles will travel long distances through air and remain in the atmosphere. Part of this lead will fall