COMMITTEEDRAFT
ISO/CD 15151 | IDF 229
8
© ISO2010
–
All rights reserved
Mn (5.4.3)
0
0,5
1
1,5
2
2,5
Zn
0
2
4
6
8
10
2
a
2
a
2
a
2
a
2
a
2
a
HNO
3
(5.2)
for 9.3.1.1
40* 40* 40* 40* 40* 40*
HNO
3
(5.1) for
9.3.1.2and 9.3.1.3
0,5 0,5 0,5 0,5 0,5 0,5
Yttrium (if applicable)
a
In caseof dry ashing2ml HNO3 is added, in case of wet digestion40ml HNO3 is added
9.3.2.2 External calibrationmethod
Aspirate the calibration solutions (9.3.2.1) in ascending order separately into the plasma and measure the
emissionof the element to bedetermined.
9.3.2.3 Measurement of test solution
Measure the number of counts at the selectedwavelength of the test solution (9.3.1) and the blank test (9.3.1)
immediately after the calibration measurements under the same conditions. Dilute (dilution factor
f
2
) the test
solution if its signal is above that of the highest standard, with the zeromember. Repeat themeasurements. In
order to check for any drift during themeasurement, perform at least one calibrating solution for each element
at the end of series. Some instrumentswill have an internal standardadded on line to correct for the drift.
10 Calculationandexpressionof results
10.1 Calculation
Calculate the element content,
w
, byusing one of the following equations:
2 1
1000
f
f
m
Vc
w
1)
or
2
1
f
f
m
Vc
w
2)
where
w
is the element, either being Ca, K, Mg, P or Na, content, in grams per kilogram, of the test sample
usingEquation 1;
w
is the element, either being Cu, Fe, Mn or Zn, content, in milligrams per kilogram, of the test
sample usingEquation 2;
c
is the element mass of the test solution (9.3.1), expressed inmilligrams per litre, calculated by the
software of the ICP-AES
V
is the volume, inmillilitres, of the flask inwhich the dry ashes (
V
= 50ml) or digested solutions (
V
=
25ml) are transferredquantitatively (9.3.1);
m
is themass, ingrams, of the test sample used in the procedure (9.1.1 or 9.1.2);
f
1
is the dilution factor of the test solution carried out during the preparation step (9.3.1.4);
MTE-03
FORWORKINGGROUP/ERPUSEONLY
DONOTDISTRIBUTE
