The delayed geochemical hazard (DGH) model was used to show that environmental pollution risk from Pb is a dynamic process as opposed to static. The DGH model describes the potential transformation and release of Pb partitioned in the different fractions of the soil that may be inert but becoming reactive when the conditions of the soil such as pH, moisture, and organic matter become favorable or when the Pb deposited into the soil exceeds the soil-holding capacity. As opposed to single extraction procedures that investigate the total amount of Pb deposited into shooting range soils, irrespective of whether that Pb is from inert or labile Pb species, the DGH model takes into consideration the mineralogical state of the Pb species and the ever-changing physicochemical characteristics of the soil. The total concentration of Pb does not give details on the bioaccessibility, bioavailability, mobility, and quantitative environmental pollution risk of deposited Pb to biota. This model was applied on a case study in shooting range soils highly polluted with Pb at concentrations of up to 38 406.87 mg/kg. The findings indicated that TAB shooting range located inside a military airbase in the southern part of Botswana may be classified as high-risk area of Pb DGH with over 65% of Pb capable of being transformed into the mobile and bioavailable chemical forms.

延迟地球化学灾害（DGH）模型用于表明铅的环境污染风险是一个动态过程，而不是静态过程。DGH模型描述了在土壤的不同部分（例如pH值，水分和有机物）变得有利或当Pb沉积到土壤中时，Pb在土壤的不同部分中可能是惰性的但变为反应性的Pb的潜在转化和释放。土壤超出了土壤保持能力。DGH模型与调查萃取范围土壤中沉积的Pb总量的单一提取方法相反，无论该Pb是来自惰性Pb物种还是不稳定Pb物种，DGH模型都考虑了Pb物种的矿物学状态和不断变化的情况。土壤的理化特性。铅的总浓度未提供沉积铅对生物群的生物可及性，生物利用度，迁移率和定量环境污染风险的详细信息。该模型应用于案例研究，研究范围为铅浓度高达38 406.87 mg / kg的铅污染的靶场土壤。调查结果表明，位于博茨瓦纳南部军事基地内的TAB靶场可能被归类为Pb DGH的高风险地区，超过65％的Pb能够转化为可移动和可生物利用的化学形式。