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Vol. 25 No. 6 (2013): Vol 25 Issue 6

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Determination of Manganese in Welded Joint and Pipe Body of API X100 Grade SAWH and SAWL Pipe for Gas Pipeline Transportation Systems

https://doi.org/10.14233/ajchem.2013.14167
Xiaodong Shao
CNPC Tubular Goods Research Institute, No. 32 Dianzier Road, Xi'an 710065, P.R. China
Xinli Han
CNPC Tubular Goods Research Institute, No. 32 Dianzier Road, Xi'an 710065, P.R. China
Guangsan Song
Zhenjiang Entry-Exit Inspection and Quarantine Bureau, No. 84 Dongwu Road, Zhenjiang 212008, P.R. China
Xiaodong He
CNPC Tubular Goods Research Institute, No. 32 Dianzier Road, Xi'an 710065, P.R. China
Yangqin Liu
CNPC Tubular Goods Research Institute, No. 32 Dianzier Road, Xi'an 710065, P.R. China
Jinlian Zhu
Zhenjiang Entry-Exit Inspection and Quarantine Bureau, No. 84 Dongwu Road, Zhenjiang 212008, P.R. China
Xiaohua Wu
Zhenjiang Entry-Exit Inspection and Quarantine Bureau, No. 84 Dongwu Road, Zhenjiang 212008, P.R. China

Corresponding Author(s) : Xiaodong Shao

shaoxd@163.com

Asian Journal of Chemistry, Vol. 25 No. 6 (2013): Vol 25 Issue 6

Abstract

With the rapid development of economy, the demands of oil and gas are further increased. Pipeline system is the main form of transportation for natural gas. The high strength pipe line steels will become the preferred materials for modern natural gas transmission pipeline. It was well known that manganese is an important element in the high strength pipe line steels. In this paper, a simple spectrophotometric method was described for the determination of manganese in X100 grade submerged-arc welding longitudinal steel pipe. The method was based on the oxidation-reduction reaction between ammonium persulphate and manganese(II) producing manganese(VII) in the presence of silver nitrate as a catalyst. The characteristic wavelength of maximum absorption of manganese(VII) was obtained locating at 530 nm. Under the optimum reaction conditions the absorption value was proportional to the concentration of manganese in the range of 0.18-2.0 % (R2 = 0.9997) and the relative standard deviation was less than 3.0 % (n = 5). The proposed method was applied successfully to determine manganese in welded joint and pipe body of X100 grade submerged-arc welding helical and submerged-arc welding longitudinal steel pipe samples.

Keywords

Manganese Spectrophotometry X100 grade SAW steel pipe Welded joint
Shao, X., Han, X., Song, G., He, X., Liu, Y., Zhu, J., & Wu, X. (2013). Determination of Manganese in Welded Joint and Pipe Body of API X100 Grade SAWH and SAWL Pipe for Gas Pipeline Transportation Systems. Asian Journal of Chemistry, 25(6), 3487–3490. https://doi.org/10.14233/ajchem.2013.14167
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