Metal-indicator complexes red indicator to Blue colour changes VERY SIMPLE to TEST
This test measures the amount of soluble calcium and magnesium ions in a mud filtrate. When measured simultaneously, the result is called total hardness. The calcium ion concentration can be determined separately and when it is subtracted from the total hardness, the magnesium ion concentration can then be determined. Different buffer-indicator combinations may be used for these determinations. It is imperative however not to intermix the various buffers and indicators.
Direction For use :
Mixing until the colour changes from RED to BLUE.
Reagent RX-TH-4 instead of Reagent RX-TH-3
Calculation :
Hardness PPM = RX-TH-3 Number of Drop X 2
Hardness PPM = RX-TH-4 Number of Drop X 5