Current Affairs 21 august 2025 – Tone Academy
High Levels of Selenium in Groundwater Syllabus: Environment Pollution (GS Paper-3) Context: The Minister of State for Jal Shakti informed the Rajya Sabha that elevated selenium levels were found in a few groundwater samples from Haryana’s Jhajjar district and Punjab’s Rupnagar district, raising concerns about potential health risks and the need for effective monitoring and remediation. About Selenium Levels in Groundwater Monitoring Authority: The Central Ground Water Board (CGWB), established in 1970, conducts regional groundwater quality assessments to support sustainable management of India’s groundwater resources. Data Collection: In 2019, CGWB analyzed 5,956 groundwater samples across 17 States/UTs for selenium. Findings: Only four samples from Jhajjar (Haryana) and Rupnagar (Punjab) exceeded the Bureau of Indian Standards (BIS) permissible selenium limit of 10 parts per billion (ppb). About Selenium Characteristics: Selenium (Se, atomic number 34) is a non-metallic chalcogen, essential in trace amounts but toxic in excess, existing in amorphous and crystalline forms. Uses: Widely used in agriculture, mining, energy generation, and industries; recognized as an emerging hazardous contaminant. Health Guidelines: The World Health Organization recommends 55–70 μ g/day for adults, with 400 μ g/day considered toxic. Health Impacts: Deficiency: Can cause Keshan disease (cardiomyopathy) and Kashin-Beck disease (bone and joint disorder). Excess: Leads to hair and nail changes, nervous system damage, fatigue, irritability, and kidney/liver damage with long-term exposure. Selenium in Groundwater Forms: Occurs as selenate (SeO4²⁻), biselenite (HSeO3⁻), and selenite (SeO3²⁻), depending on pH (7.0–9.5) and redox conditions. Sources: Natural deposits, copper smelting, mining, agriculture, and industrial discharges. BIS Standard: The acceptable limit for selenium in groundwater is 0.01 mg/liter (10 ppb). Treatment Methods: Include activated alumina adsorption, strong base anion exchange, reverse osmosis, and distillation, with reduction efficiencies of 60–98%. With reference to selenium as a groundwater contaminant in India, consider the following statements: The Bureau of Indian Standards (BIS) permissible limit for selenium in drinking water is quantitatively higher than the World Health Organization’s recommended daily dietary allowance for an adult. Selenium contamination in groundwater is exclusively an anthropogenic issue, stemming from industrial activities like copper smelting and mining. In aquatic environments, selenium primarily exists in its elemental non-metallic form, making it resistant to common water treatment methods like reverse osmosis. The official monitoring by the Central Ground Water Board (CGWB) indicates that selenium contamination is a widespread national crisis, affecting a majority of Indian states. Which of the statements given above is/are incorrect?(a) 1 and 2 only(b) 3 and 4 only(c) 1, 2 and 3 only(d) 1, 2, 3 and 4 Correct Answer: (d) 1, 2, 3 and 4 Explanation: Statement 1 is incorrect.The BIS limit is 10 parts per billion (ppb), which is 10 micrograms (μg) per liter. If an adult drinks 2 liters of water, they would consume 20 μg of selenium. The WHO recommended dietary allowance is 55–70 μ g/day . Therefore, the BIS permissible limit in water contributes only a fraction of, and is not higher than, the daily dietary allowance. Statement 2 is incorrect.The text explicitly states that sources of selenium include “Natural deposits” in addition to anthropogenic sources like mining and industry. The word “exclusively” makes the statement false. Statement 3 is incorrect.The text specifies that selenium in groundwater occurs in ionic forms like selenate (SeO4²⁻) and selenite (SeO3²⁻), not primarily in its elemental form. It also lists reverse osmosis as an effective treatment method, contradicting the claim that it is resistant to such methods. Statement 4 is incorrect.The findings state that out of 5,956 samples across 17 States/UTs, “Only four samples” exceeded the permissible limit. This indicates a localized issue in specific districts, not a “widespread national crisis.” Adi Karmayogi Abhiyan Syllabus: Government Policies & Intervention (GS Paper-2) Context: The Ministry of Tribal Affairs launched the Adi Karmayogi Abhiyan, envisioned as the world’s largest tribal grassroots leadership initiative, aligning with Janjatiya Gaurav Varsh and the Viksit Bharat @2047 vision to empower tribal communities through service, resolve, and dedication. Core Philosophy Guiding Principles: Sewa (Service), Sankalp (Resolve), and Samarpan (Dedication). Alignment: Embodies “Sabka Saath, Sabka Vikas, Sabka Prayas, Sabka Vishwas” for inclusive development. Key Components and Outcomes Adi Sewa Kendra: Established in every tribal-dominated village. Government officials and villagers dedicate fortnightly “Adi Sewa Samay” to address local issues, mentor youth, and ensure last-mile delivery of welfare schemes. Governance Lab Workshops: Multi-departmental collaborative platforms for problem-solving and convergence of welfare schemes. Tribal Village Action Plan (Vision 2030): Co-created by officers and villagers, aligning with national goals and Sustainable Development Goals (SDGs). Volunteer Roles: Adi Sahyogi: Teachers, doctors, and professionals mentoring and mobilizing communities. Adi Saathi: Self-Help Groups (SHGs), tribal elders, NRLM members, and local leaders aiding outreach and implementation. Consider the following statements regarding the Adi Karmayogi Abhiyan: The initiative mandates that the ‘Tribal Village Action Plan (Vision 2030)’ be formulated exclusively by empanelled civil society organizations to ensure objective, grassroots-level planning. The ‘Adi Sewa Kendra’ operates on the principle of ‘Samarpan’ (Dedication) by requiring government officials to permanently relocate to their assigned tribal villages for effective monitoring. The roles of ‘Adi Sahyogi’ and ‘Adi Saathi’ are designed to create a collaborative ecosystem where external professionals and internal community leaders work in tandem for mentoring and outreach. Which of the statements given above is/are correct?(a) 3 only(b) 1 and 2 only(c) 2 and 3 only(d) 1, 2 and 3 Correct Answer: (a) 3 only Explanation: Statement 1 is incorrect.The text states that the Tribal Village Action Plan is “Co-created by officers and villagers,” not formulated exclusively by civil society organizations. Statement 2 is incorrect.The text specifies that government officials and villagers dedicate “fortnightly ‘Adi Sewa Samay’”, which is a dedicated time slot, not a permanent relocation. Statement 3 is correct.The description accurately reflects the model outlined. Adi Sahyogi (teachers, doctors, professionals) are external mentors, while Adi Saathi (SHGs, tribal elders, local leaders) are internal community mobilizers. Their roles are indeed designed to create a tandem, collaborative ecosystem. “Anna-Chakra” Supply Chain Optimisation Tool Syllabus: Social Justice (GS Paper-2) Context: The Union Minister of State for Consumer Affairs, Food and Public Distribution informed Parliament about the Anna-Chakra Tool, a digital solution enhancing the efficiency of the Public