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Prediction models for bioavailability of Cu and Zn during composting: Insights into machine learning

文献类型： 外文期刊

作者： Bai, Bing 1 ; Wang, Lixia 1 ; Guan, Fachun 3 ; Cui, Yanru 3 ; Bao, Meiwen 1 ; Gong, Shuxin 1 ;

作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, State Key Lab Black Soils Conservat & Utilizat, Changchun 130102, Peoples R China

2.Univ Chinese Acad Sci, Beijing 101408, Peoples R China

3.Jilin Acad Agr Sci, Changchun 130033, Peoples R China

4.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Changchun 130102, Peoples R China

关键词： Livestock and poultry waste; Heavy metal bioavailability; Back propagation neural network; Gradient boosting regression; Random forest

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2024 年 471 卷

页码：

收录情况： SCI

摘要： Bioavailability assessment of heavy metals in compost products is crucial for evaluating associated environmental risks. However, existing experimental methods are time-consuming and inefficient. The machine learning (ML) method has demonstrated excellent performance in predicting heavy metal fractions. In this study, based on the conventional physicochemical properties of 260 compost samples, including compost time, temperature, electrical conductivity (EC), pH, organic matter (OM), total phosphorus (TP), total nitrogen, and total heavy metal contents, back propagation neural network, gradient boosting regression, and random forest (RF) models were used to predict the dynamic changes in bioavailable fractions of Cu and Zn during composting. All three models could be used for effective prediction of the variation trend in bioavailable fractions of Cu and Zn; the RF model showed the best prediction performance, with the prediction level higher than that reported in related studies. Although the key factors affecting changes among fractions were different, OM, EC, and TP were important for the accurate prediction of bioavailable fractions of Cu and Zn. This study provides simple and efficient ML models for predicting bioavailable fractions of Cu and Zn during composting, and offers a rapid evaluation method for the safe application of compost products.

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