- Take grab sample from effluent composite sampler.
- Take sample back to lab for analysis.
- Turn on DR2000 spectrophotometer
- Press 80 and Read/Enter
- Empty one chlorine total DPD packet in 25 ml. sample vial.
- Shake container and press shift, Timer 7 on machine.
- A three minute reaction period takes place.
- Pour 25 ml. of effluent sample in clean vial.
- Place blank sample in meter and press clear/zero
- Meter shows 0.00
- Remove blank and insert prepared sample vial in meter and press Read/Enter
- Record in mg/ l cl
Thomas J. Sciarrino of Windsor Locks cooks up some handy Standard Operating Procedures for the Lab. Look for new procedures each month.