You can benefit my research by this

Article Some Antioxidant Enzymes in Workers Exposed to Pollutants

Mohamed H Assaleh

There r so many kits available in market. Sigma, Merck...pick up any one...

yes i have simple methods.

Superoxide dismutase (SOD) activity

The SOD activity was determinated by NBT photochemical reduction reaction method. Centrifuge the homogenated samples , then take 0.1ml the tested enzyme solution into tubes, then add 3.8ml Met-NBT reaction mixture. 0.1ml double-distilled water instead of enzyme solution in the control. Then add 0.1ml riboflavin to each tube. After mix with vortex mixing device, illuminate the samples under a 20W fluorescent lamp. When illuminating the cuvette must keep 3cm from the lamp to make sure well-distributed，then calculate absorbance values in 560nm with a microplate reader.

Luay A. Al-Helaly Thank you, So much :)

Utsab Deb Thank you

Abeer Al Sawafi Was a great explanation, Thank you :)

Please find this document which contains the methods of SOD and other oxidative stress parameters but my advice is to find a suitable commercial kit it will be more accurate than other methods and good luck