Arsenic Pollution Current Affairs - 2019
Category Wise PDF Compilations available at This Link
According to recent study, arsenic contamination in paddy is rising from ground water in West Bengal. It reveals that rise in arsenic contamination of paddy plants due to concentration of arsenic accumulation depends on variety of paddy and its stage in crop cycle. Its concentration varies with rice variety and stage in crop cycle.
The study was carried out on two commonly consumed rice varieties — Minikit and Jaya — and it was found that latter to be more resistant to arsenic. It shows processes and dependencies of arsenic trans-location in rice from contaminated irrigation water.
It has found that arsenic contamination in paddy was higher than in previous studies. It shows that arsenic uptake in paddy plant reduces from root to grain and that its concentration is related to variety of rice cultivated. It was observed that highest concentration of arsenic was observed in initial or vegetative state in first 28 days. It reduced during reproductive stage (29-56 days) and again increased in ripening stage.
The uptake of arsenic is faster in young roots in vegetative state than in older tissues with higher concentrations of iron in root soil in reproductive phase. It also raised concerns over disposal of contaminated rice straw which is used as animal fodder or burnt or sometimes left in field itself to serve as fertiliser.
Arsenic is a natural component in Earth’s crust. It is widely distributed throughout environment in air, water and land. It is highly toxic in its inorganic form. Intake of soluble inorganic arsenic over long period can lead to chronic arsenic poisoning (arsenicosis), diabetes, cardiovascular diseases and cancer. In India, Arsenic pollution big problem in West Bengal and neighbouring states. In West Bengal, there are 83 blocks in eight districts where groundwater is arsenic contaminated. Malda, Murshidabad and Nadia districts have higher levels of arsenic concentration.
Indian Institute of Science Education and Research (IISER) in collaboration with private company has developed a new device-Arsenic Sensor and Removal Media to detect and remove arsenic content from water and make it safe and usable by households.
Arsenic Sensor and Removal Media
The device is very easy to use, very cost effective and anyone can use it to detect arsenic easily. It uses very simple and household detection sensing methodology. It is capable of sensing soluble arsenic (3) which cannot be easily detected and removed.
It can show immediate change in colour in arsenic contaminated water. It provides holistic approach in immediate detection of arsenic contamination levels from available water resources and thereafter produces arsenic-free potable water. It has high sensitivity as it can sense up to parts per billion (ppb) level compared to many currently available techniques which sense parts per million (ppm).
Arsenic is a natural component in the earth’s crust. It is widely distributed throughout the environment in the air, water and land. It is highly toxic in its inorganic form. Intake of soluble inorganic arsenic over long period can lead to chronic arsenic poisoning (arsenicosis), diabetes, cardiovascular diseases and cancer. WHO permissible limit of arsenic in groundwater is 0.1 mg per litre. . In India, it was revised recently by Bureau of Indian Standards from 0.05 mg/l to 0.01 mg/l. In India, Arsenic pollution big problem in Bengal and neighbouring states. In Bengal, there are 83 blocks in eight districts where groundwater is arsenic contaminated. Malda, Murshidabad and Nadia districts have higher levels of arsenic concentration.