Metrohm 746 VA Trace Analyzer User Manual

Page 130

4.4 Lead determination with internal standard

746 VA Trace Analyzer / 747 VA Stand

4-45

Switch to dialog page "SEGMENT"

•

Press the yellow key. The dialog page "SEGMENT"

appears with the program for measured value acquisition. The segment

DPASV

is virtually identical to the segment of the same name of the

CALCRV.mth

method (explanation, see section 4.3.3), except the enrich-

ment and start voltage is –800 mV instead of –600 mV.

Switch to dialog page "SUBSTANCES"

•

Press the yellow key. The dialog page "SUBSTAN-

CES" appears with the parameters for evaluation of the substance lead.

Except for the characteristic voltage

U.verify

(–400 mV), these are

identical to those of the

TESTPb.mth

method and are not explained fur-

ther here (see section 4.2.3).

•

Press the softkey

< >> >

. The subpage of "SUBSTANCES" appears with

the parameters for calibration of the substance lead:

Method: INTSTD SUBSTANCES

Pb - DPASV

Calibration 1996-11-22 16:35 Coefficients

ДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД

ДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДДДДДДДДД

ДДДДДДДДДДДДДДДДДДДДДДДД

Technique int std. Prop.fact. 0.5699

Mode analyte Mean dev. 0.03553

Ref.subst. CdRef

Temperature 20.0 °C

# CSoln.name Mass conc.

Range min g/L ДДДДДДДДДДДДДДДДДДДДДДДД

ДДДДДДДДДДДДДДДДДДДДДДДД

Range max g/L 0 Pb-1 2.5 ug/L

1 Pb-2 5 ug/L

M.conc./cm g/L 2 Pb-3 10 ug/L

M.conc.begin zero 3 Pb-4 20 ug/L

4 g/L

V0.CSoln. 10.000 mL 5 g/L

6 g/L

7 g/L

8 g/L

9 g/L

Modify

column

Modify

line

Select

subst.

Link to

segment

Delete

subst.

Subst.

name

•

The following is a brief explanation of the most important parameters:

Technique

Calibration technique: internal standard

Mode

Mode for parameter display: analyte

Ref.subst.

Name of reference substance:

CdRef

Temperature

Temperature of the analysis solution: 20°C

V0.CSoln.

Volume added of every calibration solution: 10 mL

Prop.fact.

Proportionality factor between analyte and reference
substance

Mean dev.

Mean deviation of the calibration curve

CSoln.name

Name of the calibration solutions

Mass conc.

Mass concentration of the calibration solutions