caa a22 4500 465749321 CHVBK 20180323111829.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00322027 doi (NATIONALLICENCE)springer-10.1007/BF00322027 Flame atomic-absorption spectrometric determination of traces of copper, iron, lead and manganese in nitric acid by injection dosation of concentrated solutions neutralized with ammonia [Elektronische Daten] [Veselin Kmetov, Lubomir Futekov] Summary: The dosation system MS-11T working in the "solvent-sample-solvent” mode was used for the flame atomic-absorption spectrometric determination of copper, lead, iron and manganese in concentrated nitric acid. The acid was neutralized with gaseous ammonia. The resulting concentrated solution of ammonium nitrate (corresponding to 46.4% HNO3) was thermostatted at 75°C and 250 μl-portions were injected into the flame. The effect of the temperature of sample and washing solvent was studied. The precision of the analysis was improved by ensemble summation of the signals. The trace element concentrations, determined by the method of standard addition, were at 0.1 mg/l level. Springer-Verlag, 1990 Kmetov Veselin Central Research Laboratory, Plovdiv University, 24 Tsar Asen St., BG-4000, Plovdiv, Bulgaria aut Futekov Lubomir Central Research Laboratory, Plovdiv University, 24 Tsar Asen St., BG-4000, Plovdiv, Bulgaria aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/8(1990-01-01), 895-897 0937-0633 338:8<895 1990 338 216 https://doi.org/10.1007/BF00322027 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00322027 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kmetov Veselin Central Research Laboratory, Plovdiv University, 24 Tsar Asen St., BG-4000, Plovdiv, Bulgaria aut NATIONALLICENCE 700 1- Futekov Lubomir Central Research Laboratory, Plovdiv University, 24 Tsar Asen St., BG-4000, Plovdiv, Bulgaria aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/8(1990-01-01), 895-897 0937-0633 338:8<895 1990 338 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer