Effects of Na-bentonite on Soil Chemical Properties in Natural Gas Pipeline Rights of Way
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Abstract
Sodium bentonite (NaB) is a lubricant used in the horizontal directional drilling (HDD) to penetrates through obstacles for constructing natural gas pipelines which cause bentonite contaminated in natural soils in the construction site. This contaminant may affect the change in soil chemical properties. Therefore, the studies on the effects of NaB on soil chemical properties in natural gas pipeline rights of way was carried out to evaluate its effect on agricultural soil properties. The experiment was studied in three acid sulfate soils and three normal soils collected from the natural gas pipeline from Rayong to Nonthaburi. The acid sulfate soils with the presence of sulfuric horizons were Sena series (Se) and Ongkharuk series (Ok). The acid sulfate soils containing the sulfidic horizons was locally named as Bang Nam Priao series (Bp), whereas the normal soils were Sattahip (Sh), Satuk (Suk) and Huai Pong (Hp). The soil samples were artificially contaminated with NaB and incubated with the ratios (NaB:soil) of 1:10, 2:10, 3:10, 4:10, 5:10, 6:10, 7:10, 8:10, 9:10 and 10:10, respectively. After incubation for two weeks, the soils were analyzed for their pH, effective electrical conductivity (ECe), exchangeable sodium percentage (ESP), sodium adsorption ratio (SAR), cation exchange capacity (CEC) and exchangeable sodium (exch. Na). The results showed that increasing NaB significantly increased with pH, CEC, ESP and SAR of acid sulfate soils, as well as significantly raised ECe, CEC, ESP and SAR of normal soils. Furthermore, NaB rates had and exponentially correlated with soil chemical properties especially pH ESP and SAR for acid sulfate and normal soils. Our results imply that the NaB can alter agricultural soil properties, especially ESP and SAR. These soil parameters need further management to yield the normal range when the contamination ratio of NaB to soil of 1:10 occurs.
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References
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