Hach DR2400 Manual page 115

Accuracy Check
Boron_PP_Other_CAR_Eng_Ody.fm
The BoroVer 3/Sulfuric Acid Solution is highly acidic. Neutralize to pH 6–9
and flush down the drain for disposal. For more information on waste
management, see Section 4.
Standard Additions Method (Sample Spike)
1. After reading test results, leave the unspiked sample in the instrument.
Verify the chemical form.
2. Touch . Touch
Options
additions procedure will appear.
3. Touch to accept the default values for standard concentration, sample
OK
volume, and spike volumes. Touch
are accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
4. Snap the neck off a Boron Voluette
5. Prepare three sample spikes. Fill three mixing cylinders (Cat. No. 1896-40)
with 25 mL of sample. Use the TenSette
0.3 mL of standard, respectively, to each sample and mix thoroughly.
6. Analyze 2.0 mL of each sample spike as described in the procedure above,
starting with the 0.1 mL sample spike. Accept each standard additions
reading by touching
recovery.
7. After completing the sequence, touch
the standard additions data points, accounting for matrix interferences. Touch
, then select
View: Fit
the sample spikes and the "Ideal Line" of 100% recovery.
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solution Method
Check the accuracy of the test using Boron Standard Solution, 10-mg/L as B.
Prepare this solution as follows:
1. Using Class A glassware, pipet 10.00 mL of the Boron Voluette Ampule
Standard, 250-mg/L B, into a 250-mL volumetric flask. Dilute to volume
with deionized water. Swirl to mix.
2. To adjust the calibration curve using the reading obtained with the
10.0-mg/L standard solution, touch
Touch
Standard Adjust: Off
3. Touch . Touch
On Adjust
depends on the selected chemical form). If an alternate concentration is used,
touch the number in the box to enter the actual concentration, then touch
Touch .
Adjust
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
. A summary of the standard
Standard Additions
to change these values. After values
Edit
®
Ampule Standard, 250-mg/L B.
®
Pipet to add 0.1 mL, 0.2 mL, and
. Each addition should reflect approximately 100%
Read
Graph
and touch
Ideal Line OK
Options
.
to accept the displayed concentration (the value
Boron
to view the best-fit line through
to view the relationship between
on the current program menu.
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.
OK
Boron