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Table 2 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
Ammonia Ionic Strength Adjustor (ISA) Powder Pillows
Ammonia Ionic Strength Adjustor (ISA) Solution
Ammonia electrode filling solution, 0.1 M NH
Ammonia standard solution, 1 mg/L as NH
Ammonia standard solution, 10 mg/L as NH
Ammonia standard solution, 100 mg/L as NH
Ammonia standard solution, 1000 mg/L as NH
Hach pH electrode storage solution
Membrane modules for ISENH3181 probes
Air gap assembly for ammonia ISE
Wash bottle, polyethylene, 500 mL
Disposable wipes, 11 x 22 cm
Beaker, 30 mL, plastic, colorless
14 English
Volume of standard to
add
0.5 mL
1.0 mL
x V
/V
)
SS
SS
T
/C
x 100
M
E
4
–N
3
–N
3
3
Concentration of standard solution
Quantity
100/pkg
500 mL
Cl
50 mL
500 mL
500 mL
–N
500 mL
–N
3
500 mL
3/pkg
280/pkg
80/pkg
1000 mg/L NH
—N
3
1000 mg/L NH
—N
3
Item no.
4447169
2824349
4447226
189149
15349
2406549
1 L
2354153
2756549
5812711
1
5025300
1
62011
2097000
SM5010
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