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Yang X.,Sun Yat Sen University | Yang X.,CAS Institute of Earth Environment | Yang J.,South China Sea Environment Monitoring Center | Su Z.,Sun Yat Sen University | And 2 more authors.
Holocene | Year: 2013

A high-resolution paleosecular variations record since ~6 kyr, including direction and relative intensity, was derived from the Pearl River delta (PRD) sediments in southern China constrained by the radiocarbon ages in this paper. The comparison of both direction and relative intensity with other adjacent records confirmed that the non-dipole field has common fluctuations in the centennial to millennial timescales. This pattern provides some profound tied points to correlate the sediment sequence in the different deposition environments. The significant age offsets of the similar secular variation features between the different records corroborate the radiocarbon errors in dating the sediments. This work further showed that the geomagnetic secular variations can serve as an effective tool to determine the sediments' age and correlate the stratigraphy for the different deposition environments in a wide region. © The Author(s) 2013. Source


Wang Z.-Y.,South China Sea Environment Monitoring Center | Zhang H.-K.,Zhongkai University of Agriculture and Engineering | Fang H.-D.,South China Sea Environment Monitoring Center | Su Y.-D.,Tongji University | Mittal G.S.,University of Guelph
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012

An FI-KR non-separated method coupled with FAAS for the determination of Fe(II) and Fe(III) was developed. With 60 s of sampling at a flow rate of 6.0 mL·min -1, EF of 41 for Fe(III) and 9 for Fe(II) were obtained. The precision(RSD, n=11) for Fe(III) and Fe(II) was 2.3% and 3.1% at the 0.04 mg·L -1 level respectively. When 0.1 ‰φ TEA was used as masking reagent, the recovery rate for Fe(III) and Fe(II) was from 97% to 101 % and from 96% to 100% respectively. Source


Wang Z.-Y.,South China Sea Environment Monitoring Center | Zhang H.-K.,Zhongkai University of Agriculture and Engineering | Fang H.-D.,South China Sea Environment Monitoring Center | Su Y.-D.,Tongji University | Mittal G.S.,University of Guelph
Yejin Fenxi/Metallurgical Analysis | Year: 2012

A new determination method of Fe(III) and Fe(II) without separation was established by flow injection (FI) knitted reactor (KR) on-line pre-enrichment and flame atomic absorption spectrometry (FAAS). The total content of Fe(II) and Fe(III) was firstly determined by FAAS. Then, based on the difference of enrichment factor (EF) after FI-KR pre-enrichment and FAAS detection, the concentration ratio between Fe(II) and Fe(III) was obtained. Consequently, the content of Fe(II) and Fe(III) could be calculated. The influencing factors on determination, including the type, flow rate and concentration of complex reagent, system pH, sampling time and flow rate, and the type and flow rate of eluent, were studied. The optimal experimental conditions were obtained. The proposed method was applied to the determination of actual water sample, and the results were consistent with those obtained by o-phen spectrophotometry. The relative standard deviations (RSD, n=11%) were less than 3.8%. Source

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