电位滴定法测水中的钙

电位滴定法测水中的钙

Ti Application Note No.Title:

Summary:T- 57Calcium in aqueous solutions by photometric titra-tionDetermination of calcium in aqueous solutions by photometric ti-

tration with EDTA using the 610 nm Spectrode.Aqueous solutions containing Ca, e.g. tap water or digestionsolutions of cementSample:

Sample

Preparation:noneInstruments and

702, 716, 736, 751 or 785 Titrino, 703 Titration Stand, 6.5501.01XAccessories:

Spectrode 610 nm, Metrodata TiNet 2Analysis:Pipette a suitable volume of sample solution into a beaker, add

2.5 mL murexide colour indicator (50 mg / 100 mL dist. water),make up to about 100 mL with dist. water and adjust the pH valueto 12 by adding w(NaOH) = 50%. Titrate with c(EDTA) = 0.1 mol/Lusing the DET or MET mode.1 mL c(EDTA) = 0.1 mol/L corresponds to 0.1 mmol or 4.008 mgCa2+

mmol/L Ca2+ = EPx * C01 * C02 / C00

EPx=titrant consumption in mL

EP1: evaluation Titrino

EP2: intersection point TiNet

C00=sample volume in mL

C01=0.1

C02=1000 (conversion factor in mL/L)Remarks:This method can also be used for the determination of calcium in

cement and other digestion solutions.Calculation:

T-57/1

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