How can I determine amount of paraquat in water by UV spectroscopy?

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Sabyasachi Sarkar

The publication you get here will help you:

https://www.researchgate.net/publication/237861923_Charge_transfer_complexes_of_diquat_and_paraquat_with_halide_anions

Article Charge transfer complexes of diquat and paraquat with halide anions

Stephen Treimer

Other than METHOD 549.2 DETERMINATION OF DIQUAT AND PARAQUAT IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND HIGH PERFORMANCE LIQUID CHROMATOGRAPHY WITH ULTRAVIOLET DETECTION

www.epa.gov/microbes/documents/m_549_2.pdf

Sasikarn Seetasang

Use sodium dithionite in strong basic solution then detect blue color of the radical of paraquat.