{"id":58442,"date":"2025-11-04T19:44:37","date_gmt":"2025-11-04T14:14:37","guid":{"rendered":"https:\/\/www.nextias.com\/ca\/?p=58442"},"modified":"2025-11-06T12:41:55","modified_gmt":"2025-11-06T07:11:55","slug":"heavy-metals-contamination","status":"publish","type":"post","link":"https:\/\/www.nextias.com\/ca\/current-affairs\/04-11-2025\/heavy-metals-contamination","title":{"rendered":"Heavy Metals Contamination"},"content":{"rendered":"\n<p><strong>Syllabus: GS3\/Pollution<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Context<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A recent study, published in Environmental Earth Sciences, reveals alarming levels of <strong>heavy metal contamination<\/strong> in fish species of Cauvery River, posing serious risks to ecosystems and public health.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>About the Heavy Metals<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>These are naturally occurring elements with <strong>high atomic weights and densities.<\/strong>&nbsp;<\/li>\n\n\n\n<li>While some like iron and zinc are essential in trace amounts, others such as <strong>lead, mercury, arsenic and cadmium<\/strong> are toxic even at low concentrations.\n<ul class=\"wp-block-list\">\n<li>These pollutants settle in river sediments and <strong>bioaccumulate in aquatic life, <\/strong>entering the human food chain through fish and drinking water.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Sources of Contamination<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Anthropogenic sources<\/strong> like coal mining, smelting, leather tanning, and many more.<\/li>\n\n\n\n<li><strong>Natural sources:<\/strong> Some heavy metals are naturally present in groundwater due to seepage from rocks, volcanic activities and forest fires&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Contamination in Water Bodies<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>River System: <\/strong>According to the<strong> Central Water Commission (CWC), <\/strong>toxic metals such as arsenic, cadmium, chromium, copper, nickel, and lead etc were found in concentrations exceeding permissible limits.\n<ul class=\"wp-block-list\">\n<li>Rivers like the <strong>Ganga, Yamuna, Cauvery, and Arkavati<\/strong> showed multi-metal pollution, often linked to industrial discharge and untreated sewage.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Groundwater Contamination: <\/strong>The Ministry of Jal Shakti confirmed that 36,873 rural habitations were affected by heavy metal contamination in groundwater.\n<ul class=\"wp-block-list\">\n<li>Arsenic and fluoride were the most common pollutants, with cadmium and lead present in isolated pockets.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Contamination in Food Sources:<\/strong> Fish from the Cauvery River and Kochi backwaters contained dangerous levels of mercury, lead, and cadmium.\n<ul class=\"wp-block-list\">\n<li>Vegetables sold in Bengaluru markets were found to contain heavy metals beyond safe limits, according to a study by EMPRI Karnataka.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Impacts of Heavy Metal Contamination<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Health Hazards:<\/strong> Causes neurological damage, kidney failure, bone deformities, cancers, and developmental disorders in children.<\/li>\n\n\n\n<li><strong>Soil Degradation: <\/strong>Reduces soil fertility and microbial activity, lowering crop yield and food quality.<\/li>\n\n\n\n<li><strong>Water Pollution<\/strong>: Contaminates rivers and groundwater, leading to bioaccumulation in fish and aquatic food chains.<\/li>\n\n\n\n<li><strong>Economic Losses<\/strong>: Affects agriculture, fisheries, and increases healthcare costs in contaminated regions.<\/li>\n\n\n\n<li><strong>Ecosystem Imbalance: <\/strong>Disrupts biodiversity, alters nutrient cycles, and damages flora and fauna in affected ecosystems.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Remedies for Heavy Metal Contamination<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Scientific and Technological Solutions:<\/strong> Eco-friendly reduction methods like <strong>adsorption, membrane filtration, and photocatalysis<\/strong> are being refined for sustainable water treatment.\n<ul class=\"wp-block-list\">\n<li><strong>Bioremediation<\/strong>: Microorganisms and plants <em>(e.g., Streptomyces Rochei) <\/em>are used to absorb and detoxify metals from soil and water.<\/li>\n\n\n\n<li><strong>Phytoremediation<\/strong>: Certain plants can extract metals from contaminated soil, offering a low-cost and green solution.<\/li>\n\n\n\n<li><strong>Biosorption: <\/strong>It relies on the utilization of various types of raw materials derived from agro-waste, plant residue, and algal and microbial biomass.<\/li>\n\n\n\n<li><strong>Reverse Osmosis:<\/strong> Water is passed through a series of semi- permeable filters.<\/li>\n\n\n\n<li><strong>Resin based water treatment technology:<\/strong>&nbsp; It uses ion exchange resins \u2014 small, porous beads \u2014 to purify water by swapping undesirable ions for harmless ones.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>KC Valley Project:<\/strong> Karnataka\u2019s treated wastewater recharge initiative helped restore groundwater quality in drought-prone areas.<\/li>\n\n\n\n<li><strong>Community and Environmental Action:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Decentralized water treatment:<\/strong> Emphasizes local solutions like sand filtration and activated carbon for rural communities.<\/li>\n\n\n\n<li><strong>Land remediation:<\/strong> Steel slag and other industrial byproducts are being repurposed to reduce soil toxicity.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Government Initiatives<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.nextias.com\/blog\/national-mission-for-clean-ganga\/\" data-type=\"link\" data-id=\"https:\/\/www.nextias.com\/blog\/national-mission-for-clean-ganga\/\">National Clean Ganga Mission (NCG)<\/a> and Namami Gange <\/strong>target industrial effluent reduction.<\/li>\n\n\n\n<li><strong>National Aquifer Mapping &amp; Management Programme (NAQUIM)<\/strong> identifies heavy-metal zones.<\/li>\n\n\n\n<li><strong>Ban on leaded petrol (BS Norms)<\/strong> and lead paint regulations (2016).<\/li>\n\n\n\n<li><strong>E-waste Management Rules (2022) <\/strong>to curb toxic discharges.<\/li>\n\n\n\n<li><strong>National Programme on Prevention &amp; Control of Fluorosis and Arsenicosis<\/strong><\/li>\n<\/ul>\n\n\n\n<p><a href=\"https:\/\/www.thehindu.com\/sci-tech\/energy-and-environment\/heavy-metals-in-cauvery-fish-study-warns-against-regular-intake\/article70210960.ece\" target=\"_blank\" rel=\"noopener\">Source: TH<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>Context<\/strong><\/p>\n<li class=\"ms-5\">A recent study, published in Environmental Earth Sciences, reveals alarming levels of heavy metal contamination in fish species of Cauvery River, posing serious risks to ecosystems and public health.<\/li>\n<p><\/p>\n<p><strong>About the Heavy Metals<\/strong><\/p>\n<li class=\"ms-5\">These are naturally occurring elements with high atomic weights and densities.\u00a0<\/li>\n<li class=\"ms-5\">While some like iron and zinc are essential in trace amounts, others such as lead, mercury, arsenic and cadmium are toxic even at low concentrations.<\/li>\n<li class=\"ms-5\">These pollutants settle in river sediments and bioaccumulate in aquatic life, entering the human food chain through fish and drinking water.<\/li>\n<p><a href=\"https:\/\/www.nextias.com\/ca\/current-affairs\/04-11-2025\/heavy-metals-contamination\" class=\"btn btn-primary btn-sm float-end\">Read\u00a0More<\/a><\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[],"class_list":["post-58442","post","type-post","status-publish","format-standard","hentry","category-current-affairs"],"acf":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/58442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/comments?post=58442"}],"version-history":[{"count":3,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/58442\/revisions"}],"predecessor-version":[{"id":58498,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/58442\/revisions\/58498"}],"wp:attachment":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media?parent=58442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/categories?post=58442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/tags?post=58442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}