Modeling analysis of the toxic effects of interior decoration materials waste containing arsenic on wheat

This paper analyzes the toxic effects of arsenic from interior decoration materials waste on wheat seeds and establishes a Terrestrial Biotic Ligand Model (TBLM) toxicity prediction model. The arsenic content of interior decoration materials was diluted to 0.10, 1.00, 5.10, 7.50, 10.00, 15.00, and 25.00 mg/L. The arsenic content was set to 50.00 mg/L to conduct the test. Wheat seeds were added to the above solutions, and the germination rate, root length, shoot length, and α-amylase activity were determined. According to the above eight concentrations of arsenic solution, wheat seedlings were divided into eight groups, and 0.00 mg/L concentration solution was used as the control group. After 30 days of cultivation, stem growth and photosynthesis’s effect on wheat’s root system were measured. The TBLM toxicity prediction model was used to predict the toxicity in the wheat roots. The results showed that 7.50 mg/L arsenic concentration caused the lowest damage to germination rate and germination length, and α-amylase activity in wheat germination was the best. Net photosynthetic rate, transpiration rate, and stomatal conductance all showed a downward trend. When As3+ concentration exceeded 7.50 mg/L, chlorophyll a, b, and carotenoids decreased. The arsenic content in wheat roots increased with the increase in arsenic concentration, and the content of chemical elements also increased. TBLM model considered the influence of ionic strength and competition effect simultaneously, which could more accurately describe the influence of chemical conditions in solution on the toxicity effect on wheat. The above experimental results indicate that arsenic-containing interior decorative materials have a significant toxic impact on wheat. When the arsenic concentration in indoor decoration material waste exceeds 7.50 mg/L, the impact on wheat growth gradually increases.