title: [Determination of trace barium in environmental samples by electric-heated AAS with lanthanum-coated graphite tube].
abstract: In this paper a new method was established for determination of trace barium in environmental samples by graphite furnace atomic absorption spectrometry. In the presence of matrix modifier magnesium nitrate, the matrix inference was eliminated efficiently. To avoid producing barium carbide, the graphite tubes were coated differently with lanthanum, zirconium, tungsten, molybdenum, and tantalum. Results showed that the tube with lanthanum was the best. The atomization temperature was diminished. The sensitivity was improved, and the tube with lanthanum gave the longest service life. So we used the tube to determine trace barium. The trace barium in Geodchemical Standard Reference Sample Soil-1 (GSS-1) was determined by the new method, the test results showed that the method was reliability and accurate. The method has been used for the determination of trace barium in environmental samples and in water of Yellow River. The detection limit for Ba was 2.1 x 10(-12) g and the relative standard deviation(RSD) was 5.4% for 15 ng.mL-1 Ba.
authors.affiliation: Center of Analysis and Testing, Zhengzhou University, Zhengzhou 450052, China.
authors.forename: Hua-yun
authors.initials: HY
authors.lastname: Han
authors.forename: Lin
authors.initials: L
authors.lastname: Lin
authors.forename: Ke
authors.initials: K
authors.lastname: Chen
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
mesh_terms: D001464:Barium / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis*; D006358:Hot Temperature; D007811:Lanthanum; D012989:Soil Pollutants / Q000032:analysis; D013054:Spectrophotometry, Atomic / Q000295:instrumentation / Q000379:methods*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004785:Environmental Pollutants; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D001464:Barium; D007811:Lanthanum