Sludges, as biosolids, are organic soil amendments commonly used in assisted phytostabilitation. Extensive studies on their environmental impacts exists, particularly for improper land application and contents of trace elements, organic compounds and pathogens, but not for their content of cationic polyacrylamide polymers (C-PAMs). Direct toxicity of C-PAMs on aquatic organisms has been demonstrated but scarce information about plant toxicity is available. In this study, the effect of C-PAMs on early plant growth was evaluated by means of standard toxicity assays. Firstly, increasing doses of C-PAMs were applied as solutions to seeds of Avena sativa, Lactuca sativa and Solanum lycopersycum to evaluate germination and root elongation. Secondly, the effect of increasing doses of C-PAMs spiked in pig manure and mixed with sand (75 t ha⁻¹dry base) was evaluated on the emergence, radicle elongation and biomass of A. sativa. Results showed high phytotoxicity of C-PAMs in solutions above 1,000 mg L⁻¹, but no effect was detected when spiked into experimental substrate; a significant effect was only observed above 5,000 mg L⁻¹ for radicle elongation, aerial biomass, and radicle biomass. Results demonstrate direct phytotoxic effects of C-PAMs, which can be mitigated when spiked into an organic (pig manure) and mineral (sand) matrix.

污泥作为生物固体，是通常用于辅助植物稳定的有机土壤改良剂。关于它们对环境的影响，已经进行了广泛的研究，尤其是对于土地的不当使用以及微量元素，有机化合物和病原体的含量，但对于阳离子聚丙烯酰胺聚合物（C-PAMs）的含量却没有。已经证明了C-PAM对水生生物的直接毒性，但缺乏有关植物毒性的信息。在这项研究中，通过标准毒性试验评估了C-PAM对植物早期生长的影响。首先，将逐渐增加剂量的C-PAMs作为溶液用于燕麦，苜蓿和番茄的种子。评估发芽和根伸长。其次，评估了在猪粪中掺加C-PAMs并与沙子（75 t ha ^-1干碱）混合的剂量对紫花苜蓿的出现，胚根伸长和生物量的影响。结果表明，在高于1,000 mg L ^-1的溶液中，C-PAMs具有很高的植物毒性，但加标到实验底物中则没有发现任何作用。仅在高于5,000 mg L ^-1时才观察到显着的作用，对胚根伸长，气生生物量和胚根生物量具有显著作用。结果表明，C-PAMs具有直接的植物毒性作用，加标到有机（猪粪）和矿物质（沙）基质中时，可以减轻。