A DETERMINATION OF CALCIUM BY FLAME AES

1 The sample is nebulised into an air-acelylene flame, where it is vaporised calcium compourxls are atomised and the CaOH molecules thus formed emit radiation of which the intensity is measured at a wavelength of 622.0 nm. 

2 This detarmination may be carried out on digest 2.1 (digestion with H SO., - salicylic 

HjOj - H F) and digest 2.7 (digestion by dry-ashing followed by treatment with HF). 

1 This procedure yields a standard curve that is linear up to approximately 50 mg/L Ca. 

2 The detection limit is approximately 2 mg/L in the digest. The determination limit is approximately 6 mg/L (7-25 mmol/kg in the dried plant material). 

---