Important effects of toxic arsenic compounds on the human body

下面为大家整理一篇优秀的essay代写范文-Important effects of toxic arsenic compounds on the human body。本文讲述砷是一种化学元素，其符号为As。像元素周期表中的许多其他元素一样，其化合物广泛用于人类生活的各个方面。例如，砷化合物可以用作木材防腐剂。在材料科学领域，由于砷化合物具有将电流转换为激光的能力，因此可以用于生产半导体。最典型的例子之一可能是Arsine气体AsH3，它已广泛应用于微芯片行业[1]。简而言之，越来越多的砷化合物被证明在医疗，农业和工业生产等一系列领域中非常有用，极大地有益于人类的生活。然而，正如俗话所说，一切都是一把两刃剑。尽管砷化合物给我们带来了所有好处，但砷化合物的不利影响却是严重的，不能忽视。事实上，砷是迄今为止在地球上发现的最具毒性的元素之一。无机形式有剧毒[2]

Arsenic is a type of chemical element whose symbol is As. Like many other elements on the periodic table of elements, its compounds are widely used in various aspect of human life. For example, arsenic compounds could be used as wood preservative. In the field of materials science, arsenic compounds could be used for producing semiconductor due to their capability to convert electric current to laser light. One of the most typical examples might be Arsine gas AsH3 which is widely applied to the microchip industry [1]. Briefly speaking, an increasing number of arsenic compounds are proved to be quite useful in a series of fields including medical treatment, agriculture and industrial production, and so on, benefiting human life to a great extent. However, as the old saying goes, everything is a two-edged sword. Despite all the benefit that arsenic compounds bring to us, the adverse effects of arsenic compounds is severe and could not be neglected. As a matter of fact, arsenic is one of the most toxic elements that are found on earth so far. It is extremely toxic in inorganic form [2].

Fig.1 AsH3

Due to the fact that inorganic arsenic is distributed in environment widely and naturally and that human and that human activities release arsenic compounds, humans could be exposed to relatively high level of toxic arsenic compounds through water, source of food such as seafood, not to mention those who have to work with arsenic, making arsenic compounds a great threat to human health. Exposure to certain level of toxic arsenic compounds could lead to a variety of health effects in humans. The adverse impact of arsenic on human health could be divided into two categories, acute effects as well as chronic effects [2]. As for acute effects, the immediate symptoms of exposure to toxic inorganic arsenic include nausea, stomachache, vomiting, and dyspepsia, and so on, because arsenic could cause nervous system disorders [3]. In addition, exposure to arsine also causes diverse symptoms such as vomiting, abdominal pains, and anemia, and so on. As for chronic effects, the effects of inorganic arsenic on humans involve the damage to nervous system, digestive system, skin, mucous membranes and even children intelligence. Additionally, inorganic arsenic could also increase the odds of infertility and miscarriage [1]. Moreover, it could cause cancer such as lung cancer and liver cancer, and therefore the International Agency for Research on Cancer classifies arsenic and its compounds as carcinogenic [2].
Obviously, the symptoms caused by arsenic could vary from individuals to individuals, races to races, areas to areas because the related risk factors could be extremely complicated. After all, physiology of human beings is quite complex as well. As a result, it would be somewhat hard to assess the toxicity and harmful effects on human health. Anyway, just in case, we need to be cautious about intake of arsenic in our daily life so that we can reduce our exposure to arsenic as much as possible. Moreover, the government and related agencies should monitor the usage and release of arsenic compounds. Furthermore, not only related researchers but also the public’s awareness of the danger of arsenic should be aroused so that we could learn to protect ourselves.

Sources:
[1] http://www.lenntech.com/periodic/elements/as.htm
[2] http://www.who.int/mediacentre/factsheets/fs372/en/
[3] http://www.epa.gov/ttn/atw/hlthef/arsenic.html

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