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Table 3 Standard solution volumes and concentrations (continued)
Measured sample
concentration
15 to 30 mg/L
30 to 60 mg/L
3. Measure the concentration of the spiked sample.
4. Calculate the expected (theoretical) concentration of the spiked sample:
C
= (C
x V
/V
) + (C
E
S
S
T
Where:
• C
= expected (theoretical) concentration of the spiked sample
E
• C
= concentration of the sample (mg/L) before the standard solution was added
S
• C
= concentration of the standard solution (mg/L)
SS
• V
= sample volume (mL) before the standard solution was added
S
• V
= volume of the standard solution (mL)
SS
• V
= total volume (standard solution volume (mL) + sample volume)
T
5. Calculate the percent recovery of the standard addition. A percent recovery of 100 (±5)% is an
indication that the sample measurements are accurate.
Percent recovery = C
Where:
• C
= measured concentration of the sample after the addition of the standard solution
M
• C
= expected (theoretical) concentration of the sample after the addition of the standard
E
solution
Section 10 Consumables
Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to
the company website for contact information.
Description
Sodium/Potassium Ionic Strength Adjustor (ISA) Powder
Pillows
Electrode filling solution, 0.02 M NH
Sodium standard solution, 10 mg/L as Na
Sodium standard solution, 100 mg/L as Na
Sodium standard solution, 1000 mg/L as Na
10.1 Accessories
Description
Beaker, polypropylene, 50 mL, low form
Disposable wipes, 11 x 22 cm
Wash bottle, polyethylene, 500 mL
Probe stand for standard Intellical probes
Soaker bottle for probe storage
18 English
Volume of standard to
x V
/V
)
SS
SS
T
/C
x 100
M
E
Cl
4
add
0.5 mL
1.0 mL
Quantity
100/pkg
59 mL
500 mL
500 mL
Quantity
1
280/pkg
1
1
1
Concentration of standard
solution
+
1000 mg/L Na
+
1000 mg/L Na
Item no.
4451569
2965126
1 L
2835153
2318149
1474949
Item no.
108041
2097000
62011
8508850
5192900
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