Total Hardness Chemical Test Kit - HI3812

35,00 €
Na zalogi

The HI3812 is a chemical test kit for total hardness as CaCO3 by titration with EDTA. The HI3812 is supplied complete with all of the reagents and equipment necessary to perform approximately 100 tests.

  • Pre-made reagents for ease of use
  • All reagents marked with expiration date and lot number for traceability
  • Manual titration performed with calmagite indicator

The HI3812-100 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate total hardness measurements with the chemical test kit. These reagents follow the EDTA titration method to determine total hardness concentration as calcium carbonate (CaCO3). For determination of total hardness, the sample solution is first buffered to pH 10. The calmagite color indicator is added to form weak complexes at this basic pH with magnesium and calcium, forming a red colored complex. Addition of the EDTA titrant solution also forms complexes with the remaining free magnesium and calcium ions. Once all of the free magnesium and calcium ions have been complexed, the excess EDTA preferentially removes the ions bound with the calmagite color indicator, forming a stronger complex. The removal of these metal ions from the indicator causes a color change from red to blue, indicating the endpoint of the titration. The number of milliliters of titrant used to reach the appropriate endpoint will determine the total hardness as mg/L CaCO3. These reagents are designed to be used with samples that have an expected total hardness range of 0.0 to 30.0 mg/L and 0 to 300 mg/L CaCO3.









Najmanjši prirast

0.3 mg/L (ppm); 3 mg/L (ppm)



Število testov

100 povprečno

Informacije o naročanju

Komplet za testiranje HI3812 vsebuje 30 ml pufra trdote, 10 ml indikatorja kalmagita, 120 ml raztopine EDTA, 20 ml plastično čašo s pokrovčkom, 50 ml plastično čašo s pokrovčkom in 1 ml brizgo s konico.



Razpon skupne trdote

0.0-30.0 mg/L (ppm); 0-300 mg/L (ppm)

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