Simultaneous determination of hydride and non-hydride forming elements by inductively coupled plasma optical emission spectrometry

Abstract

Foram estudadas as características de funcionamento de um sistema de nebulização duplo e as condições químicas para a geração de hidretos, assim como as figuras de mérito para os elementos formadores e não formadores de hidretos. Foi caracterizado o desempenho analítico do sistema de nebulização pelos limites de detecção de 0,002 até 0,0026 µg mL-1 para os elementos formadores de hidretos e entre 0,0034 e 0,0121 µg mL-1 para os elementos não formadores de hidretos, o desvio padrão relativo para 10 replicatas ao nível de 0,25 mg mL-1 e percentagens de recuperação entre 97 e 103%. A aplicabilidade do sistema foi demonstrada na determinação simultânea de Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Zn, As, Bi, Sb, Se e Te em amostras certificadas para elementos traços, NIST 1549 (leite em pó desnatado), NIST 1570a (folhas de espinafre), DORM-2 (músculo de cação) e TORT-2 (hepatopâncreas de lagosta). Os resultados obtidos foram concordantes com os teores certificados. The operating characteristics of a dual nebulization system were studied including instrumental and chemical conditions for the hydride generation and analytical figures of merit for both, hydride and non hydride forming elements. Analytical performance of the nebulization system was characterized by detection limits from 0.002 to 0.0026 µg mL-1 for the hydride forming elements and between 0.0034 and 0.0121 µg mL-1 for the non-hydride forming elements, relative standard deviation for 10 replicate measurements at 0.25 mg L-1 level and recovery percentages between 97 and 103%. The feasibiity of the system was demonstrated in the simultaneous determination

Atomic spectrometry update. Clinical and biological materials, foods and beverages

“…The increased sensitivity compared with conventional ICP-AES was used to show that bioaccessibility of these elements varied from 32 AE 14% (Ni) to 97 AE 36% (Pb). With a dual nebulisation system, Benzo et al 63 were able to simultaneously measure hydride forming and non-hydride forming elements by ICP-AES. Results for 16 elements were in good agreement with the certied values for four different biological CRMs.…”

Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species

“…Typically, solutions are introduced into the plasma by means of pneumatic (PN) or ultrasonic nebulization(USN), while chemical vapour generation (CVG) based on the reduction of the element ions with NaBH 4 in acidic medium has been widely employed to derivate elements into the form of volatile hydrides (e.g., As, Bi, Sb, Se, and Sn) or into cold vapours (Hg, Cd) [3,10]. Systems without phase separation, that is, allowing the simultaneous introduction of volatile species and sample aerosol using pneumatic nebulization, can also be used to determine both hydride and nonhydride elements [3,[11][12][13].…”