1. Adamo P, Agrelli D, Zampella M (2018) Chemical speciation to assess bioavailability, bioaccessibility and geochemical forms of potentially toxic metals (PTMs) in polluted soils. In: Vivo BD, Belkin HE, Lima A (eds) Environmental geochemistry. Elsevier, pp 153–194
2. Adelana AO, Oluwatosin GA, Agunbiade C, Are KS, Adeyolanu OD (2016) Distributions of cadmium and lead in peri-urban wetlands as influenced by soil organic matter, clay fraction, and moisture content. Cogent Food Agric 2:1159406
3. Bai W (2018) Effects of application of NTA and EDTA on accumulation of soil heavy metals in chrysanthemum. IOP Conference Series: Earth and Environmental Science. IOP Publishing, p 012175
4. Begum ZA, Rahman IM, Sawai H, Mizutani S, Maki T, Hasegawa H (2013) Effect of extraction variables on the biodegradable chelant-assisted removal of toxic metals from artificially contaminated European reference soils. Water Air Soil Pollut 224:1–21
5. Brümmer G (1986) Heavy metal species, mobility and availability in soils. In: Bernhard M, Brinckman FE, Sadler PJ (eds) The importance of chemical “speciation” in environmental processes. Springer, Berlin, pp 169–192