Mortensen G K, Egsgaard H, Ambus P, Jensen E S, Grøn C
Plant Biology and Biogeochemistry Dep, Roskilde, Denmark.
J Environ Qual. 2001 Jul-Aug;30(4):1266-70. doi: 10.2134/jeq2001.3041266x.
Widespread application of sewage sludge to agricultural soils in Denmark has led to concern about the possible accumulation and effects of linear alkylbenzene sulfonate (LAS) in the soil ecosystem. Therefore, we have studied the uptake and degradation of LAS in greenhouse pot experiments. Sewage sludge was incorporated into a sandy soil to give a range from very low to very high applications (0.4 to 90 Mg dry wt. ha(-1)). In addition, LAS was added as water solutions. The soil was transferred to pots and sown with barley (Hordeum vulgare L. cv. Apex), rape (Brassica napus L. cv. Hyola 401), or carrot (Daucus carota L.). Also, plant-free controls were established. For all additions there was no plant uptake above the detection limit at 0.5 mg LAS kg(-1) d.w, but plant growth stimulated the degradation. With a growth period of 30 d, LAS concentrations in soil from pots with rape had dropped from 27 to 1.4 mg kg(-1) dry wt., but in plant-free pots the concentration decreased only to 2.4 mg kg(-1) dry wt. When LAS was added as a spike, the final concentration in soil from planted pots was 0.7 mg kg(-1) dry wt., but in pots without plants the final concentration was much higher (2.5 mg kg(-1) dry wt.). During degradation, the relative fraction of homologues C10, C11, and C12 decreased, while C13 increased.
在丹麦，污水污泥广泛应用于农业土壤，这引发了人们对土壤生态系统中直链烷基苯磺酸盐（LAS）可能的积累及其影响的担忧。因此，我们在温室盆栽试验中研究了LAS的吸收和降解情况。将污水污泥添加到沙质土壤中，施用量范围从极低到极高（0.4至90 Mg干重·公顷⁻¹）。此外，以水溶液形式添加LAS。将土壤转移到花盆中，播种大麦（Hordeum vulgare L. cv. Apex）、油菜（Brassica napus L. cv. Hyola 401）或胡萝卜（Daucus carota L.）。同时，设置了无植物对照。对于所有添加情况，在LAS干重为0.5 mg·kg⁻¹时，植物吸收量均未超过检测限，但植物生长促进了降解。在30天的生长周期内，种植油菜的花盆土壤中LAS浓度从27 mg·kg⁻¹干重降至1.4 mg·kg⁻¹干重，而无植物花盆中的浓度仅降至2.4 mg·kg⁻¹干重。当以峰值形式添加LAS时，种植花盆土壤中的最终浓度为0.7 mg·kg⁻¹干重，而无植物花盆中的最终浓度则高得多（2.5 mg·kg⁻¹干重）。在降解过程中，同系物C10、C11和C12的相对比例下降，而C13增加。
