Ion Uptake Determination of Dendrochronologically-Dated Trees Using Neutron Activation Analysis

Kenan Unlu ; P.I. Kuniholm ; D.K.H. Schwarz ; N.O. Cetiner ; J.J. Chiment

关键词: ACIDIFICATION;    BIOCHEMISTRY;    GOLD;    NEUTRON ACTIVATION ANALYSIS;    NUTRIENTS;    PRECIPITATION;    SOILS;    TRACE AMOUNTS;    TREE RINGS;    TREES;   

DOI  :  10.2172/950837
RP-ID  :  DOe/ID/14702
PID  :  OSTI ID: 950837
Others  :  TRN: US200911%%303

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Uptake of metal ions by plan roots is a function of the type and concentration of metal in the soil, the nutrient biochemistry of the plant, and the immediate environment of the root. Uptake of gold (Au) is known to be sensitive to soil pH for many species. Soil acidification due to acid precipitation following volcanic eruptions can dramatically increase Au uptake by trees. Identification of high Au content in tree rings in dendrochronologically-dated, overlapping sequences of trees allows the identification of temporally-conscribed, volcanically-influenced periods of environmental change. Ion uptake, specifically determination of trace amounts of gold, was performed for dendrochronologically-dated tree samples utilizing Neutron Activation Analysis (NAA) technique. The concentration of gold was correlated with known enviironmental changes, e.g. volcanic activities, during historic periods.