Flame atomic absorption and ICP-atomic emission spectroscopic determination of Cu, Zn and Cd in solid suspensions of biological samples
1987
Petrucci, G. (Toronto Univ., Ontario (Canada). Dept. of Chemistry) | Loon, J.C. van
A method, based on slurrying of solids, is described for the direct, routine flame atomic absorption (flame AAS) and inductively-coupled plasma atomic emission (ICP-AES) spectroscopic trace determination of Cu, Zn and Cd in solid biological samples. The sample powder (particles below 20 mum)-between 40 and 100 mg - is firstly wetted with a 0.5 per cent sodium hexa-metaphosphate solution and is then dispersed in a 5.6 per cent v/v nitric acid solution. Both magnetic and ultrasonic stirring were evaluated. The latter proved to be the more effective especially when dealing with the higher concentration suspensions. The suspension is then aspirated directly into the spetrometer. Direct comparison with aqueous calibration standards can be used in all cases. All samples were analyzed with an accuarcy of (+-) 10 per cent and a precision (relative standard deviation) of better than 7 per cent. The limits of detection were as low as 2.0 x 10(-2) mug/g for zinc. Sensitivities, reported as concentration required to give a 0.0044 absorbance signal, were as low as 2.4 x 10(-2) mug/g for zinc. The advantages of this method are its simplicity, low cost, speed of analysis and simple and rapid calibration
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by ZB MED Nutrition. Environment. Agriculture
