Hach DR2400 Manual page 419

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Table of Contents

Accuracy Check

Nickel_UniCell_Other_DIMETH_Eng_Ody.fm

Standard Additions Method (Sample Spike)

1. After reading test results, leave the sample cell (unspiked sample) in the

additions procedure will appear.

to accept the default values for standard concentration, sample

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. Prepare three sample spikes. Fill three mixing cylinders with 100 mL of

sample. Use a pipet to add 0.1 mL, 0.2 mL, and 0.3 mL of 1000-mg/L

Ni standard, respectively, to each sample and mix each thoroughly.

5. Transfer 4 mL of each solution into a sample vial and analyze as described in

the procedure. Accept each standard additions reading by touching

Each addition should reflect approximately 100% recovery.

6. After completing the sequence, touch

the standard additions data points, accounting for matrix interferences. Touch

, then select

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

1. Prepare a 2.00-mg/L Nickel stock solution by pipetting 0.20 mL of Nickel

Standard Solution, 1000-mg/L as Ni, into a 100-mL volumetric flask. Dilute

to the mark with deionized water. Prepare this solution daily.

2. To adjust the calibration curve using the reading obtained with the

2.00-mg/L working solution, touch

Standard Adjust

concentration is used, touch the number in the box to enter the actual

concentration, then touch

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

to accept the displayed concentration. If an alternate

to view the best-fit line through

to view the relationship between

on the current program menu.