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Popular wood and sugarcane bagasse biochars reduced uptake of chromium and lead by lettuce from mine-contaminated soil.
Environmental Pollution ( IF 7.6 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.envpol.2020.114446 Amir Zeb Khan 1 , Sardar Khan 1 , Tehreem Ayaz 2 , Mark L Brusseau 3 , Muhammad Amjad Khan 1 , Javed Nawab 4 , Said Muhammad 5
Environmental Pollution ( IF 7.6 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.envpol.2020.114446 Amir Zeb Khan 1 , Sardar Khan 1 , Tehreem Ayaz 2 , Mark L Brusseau 3 , Muhammad Amjad Khan 1 , Javed Nawab 4 , Said Muhammad 5
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As a result of metal mining activities in Pakistan, toxic heavy metals (HMs) such as chromium (Cr) and lead (Pb) often enter the soil ecosystem, accumulate in food crops and cause serious human health and environmental issues. Therefore, this study examined the efficacy of biochar for contaminated soil remediation. Poplar wood biochar (PWB) and sugarcane bagasse biochar (SCBB) were amended to mine-contaminated agricultural soil at 3% and 7% (wt/wt) application rates. Lactuca sativa (Lettuce) was cultivated in these soils in a greenhouse, and uptake of HMs (Cr and Pb) as well as biomass produced were measured. Subsequently, health risks were estimated from uptake data. When amended at 7%, both biochars significantly (P<0.01) reduced plant uptake of Cr and Pb in amended soil with significant (P<0.01) increase in biomass of lettuce as compared to the control. Risk assessment results showed that both biochars decreased the daily intake of metals (DIM) and associated health risk due to consumption of lettuce as compared to the control. The Pb human health risk index (HRI) for adults and children significantly (P<0.01) decreased with sugarcane bagasse biochar applied at 7% rate relative to other treatments (including the control). Relative to controls, the SCBB and PWB reduced Cr and Pb uptake in lettuce by 69%, 73.7%, respectively, and Pb by 57% and 47.4%, respectively. For both amendments, HRI values for Cr were within safe limits for adults and children. HRI values for Pb were not within safe limits except for the sugarcane bagasse biochar applied at 7%. Results of the study indicated that application of SCBB at 7% rate to mine impacted agricultural soil effectively increased plant biomass and reduced bioaccumulation, DIM and associated HRI of Cr and Pb as compared to other treatments and the control.
中文翻译：
流行的木材和甘蔗渣生物炭减少了生菜对矿山污染土壤中铬和铅的吸收。
由于巴基斯坦的金属采矿活动，铬（Cr）和铅（Pb）等有毒重金属（HMs）经常进入土壤生态系统，在粮食作物中积累，造成严重的人类健康和环境问题。因此，本研究检验了生物炭修复污染土壤的功效。将杨木生物炭 (PWB) 和甘蔗渣生物炭 (SCBB) 以 3% 和 7% (wt/wt) 的施用量修改为受矿山污染的农业土壤。在温室中的这些土壤中种植生菜（Lactuca sativa），并测量重金属（Cr 和 Pb）的吸收以及产生的生物量。随后，根据摄取数据估计健康风险。当修正量为 7% 时，与对照相比，两种生物炭均显着（P<0.01）降低了修正土壤中植物对 Cr 和 Pb 的吸收，同时生菜生物量显着（P<0.01）增加。风险评估结果表明，与对照相比，两种生物炭均降低了每日金属摄入量 (DIM) 以及因食用生菜而产生的相关健康风险。与其他处理（包括对照）相比，施用7%甘蔗渣生物炭后成人和儿童的Pb人类健康风险指数（HRI）显着降低（P<0.01）。与对照相比，SCBB 和 PWB 使生菜中 Cr 和 Pb 的吸收量分别减少了 69%、73.7%，Pb 的吸收量分别减少了 57% 和 47.4%。对于这两项修正案，Cr 的 HRI 值均在成人和儿童的安全范围内。除施用 7% 的甘蔗渣生物炭外，Pb 的 HRI 值不在安全范围内。 研究结果表明，与其他处理和对照相比，在受矿山影响的农业土壤中施用 7% 的 SCBB 有效增加了植物生物量，并减少了 Cr 和 Pb 的生物累积、DIM 和相关 HRI。
更新日期：2020-04-03
中文翻译：
流行的木材和甘蔗渣生物炭减少了生菜对矿山污染土壤中铬和铅的吸收。
由于巴基斯坦的金属采矿活动，铬（Cr）和铅（Pb）等有毒重金属（HMs）经常进入土壤生态系统，在粮食作物中积累，造成严重的人类健康和环境问题。因此，本研究检验了生物炭修复污染土壤的功效。将杨木生物炭 (PWB) 和甘蔗渣生物炭 (SCBB) 以 3% 和 7% (wt/wt) 的施用量修改为受矿山污染的农业土壤。在温室中的这些土壤中种植生菜（Lactuca sativa），并测量重金属（Cr 和 Pb）的吸收以及产生的生物量。随后，根据摄取数据估计健康风险。当修正量为 7% 时，与对照相比，两种生物炭均显着（P<0.01）降低了修正土壤中植物对 Cr 和 Pb 的吸收，同时生菜生物量显着（P<0.01）增加。风险评估结果表明，与对照相比，两种生物炭均降低了每日金属摄入量 (DIM) 以及因食用生菜而产生的相关健康风险。与其他处理（包括对照）相比，施用7%甘蔗渣生物炭后成人和儿童的Pb人类健康风险指数（HRI）显着降低（P<0.01）。与对照相比，SCBB 和 PWB 使生菜中 Cr 和 Pb 的吸收量分别减少了 69%、73.7%，Pb 的吸收量分别减少了 57% 和 47.4%。对于这两项修正案，Cr 的 HRI 值均在成人和儿童的安全范围内。除施用 7% 的甘蔗渣生物炭外，Pb 的 HRI 值不在安全范围内。 研究结果表明，与其他处理和对照相比，在受矿山影响的农业土壤中施用 7% 的 SCBB 有效增加了植物生物量，并减少了 Cr 和 Pb 的生物累积、DIM 和相关 HRI。
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