chelating
CHAPTER I
The Problem and the Background
Introduction
According to Bruce-Gregorios (2006), “chelating agents are substances which combine with calcium ions and other salts (e. g. iron and magnesium deposits) to form weakly dissociated complexes and facilitate removal of calcium salt.”
Chelating agents are organic compounds capable of linking together metal ions to form complex ring-like structure called chelates. Chelators act according to a general principle: the chelator forms a complex with the respective (toxic) ion, and these complexes reveal a lower toxicity and are more easily eliminated from the body. (Flora, S., Romano, J., Baskin, S., & Sekhar, K., 2004).
According to Reinhardt & Reidy(2011), “chelating agents can be used for a variety of reasons – the most critical is metal removal from the solution to prevent redeposition. . Although chelating agents are defined as having multiple sites to bind with a metal ion, sometimes irreversibly, the disposal of these metal-containing organic compounds is difficult due to local laws. Therefore, most solutions use a complexing agent that acts like a chelating agent."
In the Philippines, narra wood is the choicest timber for furniture, cabinet-work, panelling, carvings, and flooring. In Malaya, Sabah, Indonesia, and Papua New Guinea, it is considered to be the finest indigenous furniture wood. It is a lustrous and decorative wood noted for taking a high polish. In contact with water, it gives off an iridescent blue-green glow; cups turned from narra wood were once considered gifts fit for royalty. It is still in great demand for expensive furniture and is sometimes sold as mahogany-Tenas-serim mahogany. Narra is the national tree of the Philippines and its wood is an important export (National Academies, 1979).
Background of the Study
For the sake of the efficacy and effectivity of a particular substance, various studies have been made. Different chemicals are invented, improved and modified to
The Problem and the Background
Introduction
According to Bruce-Gregorios (2006), “chelating agents are substances which combine with calcium ions and other salts (e. g. iron and magnesium deposits) to form weakly dissociated complexes and facilitate removal of calcium salt.”
Chelating agents are organic compounds capable of linking together metal ions to form complex ring-like structure called chelates. Chelators act according to a general principle: the chelator forms a complex with the respective (toxic) ion, and these complexes reveal a lower toxicity and are more easily eliminated from the body. (Flora, S., Romano, J., Baskin, S., & Sekhar, K., 2004).
According to Reinhardt & Reidy(2011), “chelating agents can be used for a variety of reasons – the most critical is metal removal from the solution to prevent redeposition. . Although chelating agents are defined as having multiple sites to bind with a metal ion, sometimes irreversibly, the disposal of these metal-containing organic compounds is difficult due to local laws. Therefore, most solutions use a complexing agent that acts like a chelating agent."
In the Philippines, narra wood is the choicest timber for furniture, cabinet-work, panelling, carvings, and flooring. In Malaya, Sabah, Indonesia, and Papua New Guinea, it is considered to be the finest indigenous furniture wood. It is a lustrous and decorative wood noted for taking a high polish. In contact with water, it gives off an iridescent blue-green glow; cups turned from narra wood were once considered gifts fit for royalty. It is still in great demand for expensive furniture and is sometimes sold as mahogany-Tenas-serim mahogany. Narra is the national tree of the Philippines and its wood is an important export (National Academies, 1979).
Background of the Study
For the sake of the efficacy and effectivity of a particular substance, various studies have been made. Different chemicals are invented, improved and modified to