8 October 2012 06:30 pm
Former Professor of Soils and Water Resources, Rajarata University
A seminar on CKDU, organized by the Ministry of Water Supply and Drainage was held in Anuradhapura where a report of the study on CKDU, conducted by Centre for Science and Environment (CSE) in India and Centre for Environmental Justice, Sri Lanka (CEJ) was presented by Chandra Bhushan of CSE and Hemantha Withanage of CEJ. The results of this study indicate that water samples collected from North Central Region are not contaminated with heavy metals and arsenic; nor are there any other heavy metals.
Only fluoride levels detected in the water samples were between 0.5 and 1.7 mg/l, a little above twice the desirable levels set by Sri Lanka standards. As the desirable limit for fluoride is 0.6 mg/L in Sri Lanka and levels detected in the present study are higher, fluoride at these levels over a long period of time is a possible risk factor responsible for kidney diseases.
Arsenic in Fertilizers and Pesticides:
Some are of the view that fertilizers and pesticides are the sources of arsenic, and hence, importation and use of such agrochemicals should be banned. However, before it is implemented it is necessary that that the fertilizers and pesticides which are supposed to contain arsenic are identified by appropriate tests. If the source of arsenic is fertilizers and/ or pesticides, then water in other districts such as Kandy, Nuwara Eliya , Hambantota etc. where large amounts of fertilizers and pesticides are used should also have high contents of these heavy metals, and the people in those areas should also be affected by CKDU.
Fertilizer and pesticides are not the only sources of arsenic and other heavy metals. Some organic fertilizers such as compost may also contain these heavy metals if solid waste has been used in its manufacture.
Fertilizers and Pesticides
Authors of some articles appear to be of the opinion that we need not use chemical fertilizers (Fs) and pesticides (Ps), because in the past these were not used in crop
A large number of people in the North Central Province are affected by CKDU. In order to take necessary remedial measures, the scientists are conducting studies on different aspects of CKDU. While such studies are carried out, it is extremely important that action is taken to reduce the prevalence of this lethal renal disease which is causing untold hardships to the thousands of poor people in the dry zone.There is a need for a comprehensive public health effort to effectively address the problem of CKDU. This should be taken as a National Priority with the main responsibility resting on the Ministry of Health.
From the observations and results of various studies carried out so far it could be assumed that CKDU is caused by a toxic element/s or compounds in water.
Hence, methods of detoxifying water needs to be developed. A filter has been developed by the Water Supply and Drainage Board to remove fluoride from water. Institute of Fundamental studies has developed an electro-chemical method of removing fluoride from water. The suitability of these methods needs to be tested by an appropriate authority. One way of reducing the incidence of CKDU is implementing a programme to supply good quality water to those in the affected areas.
Rainwater:
Rainwater is the most pure form of water. It is almost free of toxic elements/compounds. A considerable portion of the rainwater that falls on the roofs of buildings can be collected in tanks in the premises itself. Water thus collected would be free of toxic substances and could be used for numerous domestic purposes including drinking.