Waters IC-Pak Column and Guard - Manual (Page 7)

[ Care and Use ManUal ]
IC-Pak Column and Guard Column 7
The following sample equation shows how these weights were
determined:
1 g CI - /L x 58.44 g NaCl/35.45 g Cl - x 1 L = 1.6485 g NaCl
2. Fill the flask to the mark with 18 megohm water. Store the stock
solutions in clean plasticware for up to one month.
3. Prepare a working standard containing all seven anions by combining
volumes of the stock standards as follows in a 100 mL volumetric
flask:
Table 5: Stock Standard Volumes
Fill the flask to the mark with 18 megohm water. Table 6 contains the
species concentrations in the working standard.
Table 6: Anion Working Standard Concentrations
d. Cation Calibration Standard Preparation
Cation standard concentrates may be purchased from most major
chemical suppliers. Use the highest purity solutions available. A
number of anionic species can cause the precipitation of alkali
and alkaline earth metals. Consult solubility tables to avoid these
species. Also, avoid hygroscopic salts.
1. To prepare individual 1000 ppm (mg/L) stock standards, refer to Table
7 for the weight of salt required. Select the highest purity salt available
(atomic absorption standards if possible), weigh the specified amount,
and add to a 1 liter volumetric flask.
Table 7: Salt Weight for Cation Stock Solution Preparation
The following sample equation shows how these weights were
determined:
1 g K + /L x 74.553 g KCI/39.100 g K + x 1 L = 1.9067 g KCI
2. Fill the flask to the mark with 18 megohm water.
3. Store the stock solutions in clean plasticware for up to one month.
4. Prepare a working standard for monovalent or divalent cations. Take
volumes of the stock standards as follows and combine in a 100 mL
volumetric flask.
For monovalent cation use the following volume of the appropriate
stock solutions:
For divalent cation use the following volume of the appropriate
stock solutions:
Anion Stock
Solution
Volume (µL)
Fluoride 100
Chloride 200
Nitrite 400
Bromide 400
Nitrate 400
Phosphate 600
Sulfate 400
Anion Stock
Solution
ppm
Fluoride 1
Chloride 2
Nitrite 4
Bromide 4
Nitrate 4
Phosphate 6
Sulfate 4
Cation (expressed
as compound listed)
Compound Weight in grams
Li + LiOH • H
2
O 6.0476
Na + NaCl 2.5421
NH
4
+ NH
4
CI 2.9640
KCI 1.9067
Mg +2 Mg(N0
3
)
2
• 6H
2
0 10.5466
Ca +2 Ca(N0)
2
• 4H
2
0 5.8919
Sr +2 Sr(N0
3
)
2
• 4H
2
O 3.2377
Ba +2 BaCl
2
• 2H
2
O 1.7786
Lithium 10 µL
Sodium 50 µL
Ammonium 100 µL
Potassium 100 µL
Magnesium 200 µL
Calcium 400 µL
Strontium 600 µL
Barium 1600 µL