ONORM EN 12498 : 2005

Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents
   4.1 General
   4.2 Nitric acid (HNO[3]), 65% (d = 1.42)
       4.2.1 Nitric acid (4.2), diluted 1:1 (V/V) with water
       4.2.2 Nitric acid (4.2), diluted to 1% (V/V) with water
   4.3 Hydrochloric acid (HCl), 36% (d = 1.19)
   4.4 Hydrochloric acid (HCl), 0.3 mol/l solution
   4.5 Cadmium - stock solution (Cd) = 1000 mg/l
   4.6 Lead - stock solution (Pb) = 1000 mg/l
   4.7 Matrix modifiers
       4.7.1 Ammonium dihydrogen phosphate (NH[4]H[2]PO[4])
             solution, 100.0 g/l
       4.7.2 Palladium nitrate (Pd(NO[3])[2]) solution,
             21.7 g/l (= 1% Pd)
       4.7.3 Magnesium nitrate (Mg(NO[3])[2]) solution,
             61.0 g/l (= 1% Mg)
   4.8 Gases for atomic absorption spectrometry
5 Apparatus
   5.1 General
   5.2 General laboratory equipment
   5.3 Volumetric flasks, 1000 ml
   5.4 Analytical balance, accuracy 0,1 mg
   5.5 Micropipettes from 5,0 [mu]l to 20,0 [mu]l with
       plastique tips (high density polyethylene/polypropylene
       bottles)
   5.6 Atomic absorption spectrometer, with graphite tube
       furnace, and with background correction or inductively
       coupled plasma atomic emission spectrometer with background
       correction and radio frequency-generator
6 Preparation of sample
7 Procedure
   7.1 General
   7.2 Preparation of reference solutions
   7.3 Determination of cadmium and lead
       7.3.1 General
       7.3.2 Calibration curve
       7.3.3 Suggested spectrometer settings
       7.3.4 Determination of blank value
8 Expression of results
9 Precision
10 Test report