纳米TiO2和ZnO颗粒对红壤理化性质的影响

Impact of TiO2 and ZnO Nanoparticles on Red Soil Physico-chemical Properties

通过对耕作红壤的现场实验,较为系统的反映了人工纳米颗粒(TiO2、ZnO)对土壤理化性质的影响。数据表明,在本实验周期(90 d)内,耕作红壤掺杂不同剂量(0.1 mg/g、0.2 mg/g、0.5 mg/g、1 mg/g、3 mg/g)人工纳米颗粒后,纳米颗粒显著提升了土壤pH和电导率值;纳米颗粒对土壤微生物菌落数有一定的抑制作用;纳米颗粒对土壤有机质含量的影响不明显。整体而言,人工纳米颗粒(TiO2、ZnO)进入土壤体系后,对土壤理化性质产生了一定程度的影响,且剂量越大,影响越明显。

Nanomaterials have nanostructured components with at least one dimension less than 100 nm. Nanomaterials are already widely used in the various industries due to the special physical and chemical properties they exhibit compared to the bulk material. Increasing production and use of nanomaterials have raised concerns about their potential negative ecological and environmental impacts. Nano-TiO2 and Nano-ZnO are among the most highly used nanomaterials in industry. And they are introduced into the soil as a result of a number of human activities, including intentional and unintentional releases. In this study, based on field test, the impacts of nano-TiO2 and Nano-ZnO on red soil physico-chemical properties were systematically investigated from four aspects including soil pH, soil organ matter, microbial colonies and electric conductivity(EC). Experimental results showed the soil physico-chemical properties of red soil was impacted after mixed with different dosages (0.1, 0.2, 0.5, 1, 3 mg/g) of nano-TiO2 and Nano-ZnO, and higher dosages of nanoparticles, the more impact obvious.