A manual for testing calcium and magnesium content in irrigation water
This document provides instructions for using the Hanna Instruments HI 38081 Calcium and Magnesium Test Kit. The kit is designed for analyzing irrigation water samples to determine total hardness caused by these minerals.
The manual details the contents of the kit, including reagents and glassware, and explains the chemical reaction where EDTA titrates calcium and magnesium ions until a color change from red to blue occurs. It includes step-by-step procedures for sample preparation, titration, and calculating results in meq/L or mg/L.
| Range | > 0 meq/L as Ca & Mg |
|---|---|
| Smallest Increment (1.0 mL sample) | 0.6 meq/L |
| Smallest Increment (3.0 mL sample) | 0.2 meq/L |
| Analysis Method | Titration |
| Sample Size | 1.0 mL or 3.0 mL |
| Number of Tests (average) | 100 |
The kit uses a titrimetric method where EDTA complexes with calcium and magnesium ions, indicated by a color change from red to blue.
Multiply the milliliters of titrant used by 20.
Multiply the milliliters of titrant used by 60.
Multiply the meq/L value by 50.