B DETERMINATION OF LEAD BY ICP-OES

1 Solutions with lead compounds are nebulised into an argon plasma, where all components are vaporised. Lead compounds are dissociated arxl excited, arxl then emit radiation of which the intensity is measured at a wavelength of 220.353 nm. 

2 This determination may be carried out on digest 2.3 (microwave digestion with 

HNO3 - HjOj, - HF), digest 2.4 (digestion with HNO3 - - HF) and digest 2.7 

1 This procedure yields a standard curve that is linear up to at least 2 mg/L Pb. 

2 The detection limit is approximately 0.04 mg/L in the digest. The determination limit is approximately 0.12 mg/L (13 respectively 40 mg/kg in the dried plant material). 

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