https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35325 r and t₅₀. The two newer methods implies automatic, multi-point curve fitting, with output for not only c but also for the initial condition, the parameter error and some reliability information. The results indicate that the dissipation tests are good tools to identify soil property/layer boundary information, the new methods can be used to study the partly drained penetration and to get c value using tests shorter than the t₅₀ testing time.]]> Mon 15 Jul 2019 16:15:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50223 Mon 10 Jul 2023 10:44:41 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32987 m) and maximum reaction velocity (V_max) values of soil ACP ranged from 1.18 to 3.77 mM and 0.025–0.133 mM h⁻¹ in uncontaminated soils. The kinetic parameters of soil ACP in different soils changed differently with As contamination. The K_m remained unchanged and V_max decreased with increase of As concentration in most acid and neutral soils, indicating a noncompetitive inhibition mechanism. However, in alkaline soils, the K_m increased linearly and V_max decreased with increase of As concentration, indicating a mixed inhibition mechanism that include competitive and noncompetitive. The competitive inhibition constant (K_ic) and noncompetitive inhibition constant (K_iu) varied among soils and ranged from 0.38 to 3.65 mM and 0.84–7.43 mM respectively. The inhibitory effect of As on soil ACP was mostly affected by soil organic matter and cation exchange capacity. Those factors influenced the combination of As with enzyme, which resulted in a difference of As toxicity to soil ACP. Catalytic efficiency (V_max/K_m) of soil ACP was a sensitive kinetic parameter to assess the ecological risks of soil As contamination.]]> Fri 17 Aug 2018 15:43:55 AEST ]]>