4
Required Solutions
Distilled or Deionized Water -
To prepare all
solutions and standards
Standard Solutions
Standard Solutions -
0.1 M Sodium Bicarbonate
Standard Solution
1000 ppm as CaCO
3
Standard Solution
1000 ppm as CO
2
Standard Solution - To
prepare, dilute 22.7 mL of 0.1 M standard,
Orion No. 950206, to 10 mL in a volumetric flask
Carbon Dioxide Buffer Solution -
To adjust
solution pH to the operating range of the
electrode, 5 mL Carbon Dioxide Buffer must be
added to each 50 mL sample and
standard solution
Storage Solution -
To store the electrode, 0.1 M
Sodium Chloride (NaCl)
Internal Filling Solution -
To fill the electrode.
For inner body check
:
pH 4.01 Buffer (with 0.1 M NaCl added) - for
checking inner body operation. Use Orion Buffer
(Orion No. 910104), or prepare 200 mL pH 4.00
buffer from Orion Buffer Powder (Orion No.
910004). Add 1.16 g reagent-grade NaCl to 100
mL of the buffer solution. Dissolve solid and
store the buffer for repeated use. Discard buffer
if turbidity develops
pH 7.00 Buffer (with 0.1 M NaCl added) - for
checking inner body operation. Use Orion Buffer
(Orion No. 910107), or prepare 200 mL pH 7.00
buffer from Orion Buffer Powder (Orion No.
910007). Add 1.16 g reagent-grade NaCl to 100
mL of the buffer solution. Dissolve solid and
store the buffer for repeated use. Discard buffer
if turbidity develops
Orion No.
950206
950207
Customer
prepared
950210
941706
950202
Customer
prepared
Customer
prepared
