Description

Lovibond DPD No. 1 Specification

1. General Information

• Product name: DPD No. 1 Reagent (Lovibond)
• Type: Photometric / colorimetric reagent
• Form: Tablets (rapid, HR, or High Calcium versions available)
• Application: Free chlorine / residual chlorine testing
• Method: DPD (N,N-diethyl-p-phenylenediamine) method
• Manufacturer: Lovibond (Tintometer Group)

2. Measurement Principle

• DPD No. 1 reacts with free chlorine (Cl₂, HOCl, OCl⁻)
• Produces a pink/magenta colour
• Intensity is measured using:
  • Colorimeter
  • Photometer
  • Comparator disc system