The aim of this study was to characterize the leachate derived from biochar produced from malt spent rootlets (MSR) and to evaluate the required washing level in order to provide water free from inorganic substances. MSR biochar was placed in a column and subjected to six serial washes with distilled water, and the leachate was analysed for main anions and heavy metals. The 1st wash aliquot contained increased levels of mainly phosphates (980 mg/L) and chlorides (760 mg/L), and lower levels of nitrates, sulfates, fluoride and bromide, which were decreased over washes. Zero concentrations were observed after three washes for most anions. The increased levels of Zn, Be, Cs, Mn, V and Se determined in the 1st wash aliquot were eliminated in the successive washes. The toxic potency of each wash aliquot, determined by the use of the fairy shrimp Thamnocephalus platyurus showed that the 1st and 2nd MSR biochar leachates were toxic with 4.52 and 1.46 toxic units (TU), respectively, followed by a significant elimination of toxicity after further washes.

中文翻译：

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麦芽废根生物炭渗滤液的理化和毒理学分析。

这项研究的目的是表征从麦芽废根（MSR）产生的生物炭中提取的渗滤液，并评估所需的洗涤水平，以提供不含无机物质的水。将MSR生物炭置于柱中，并用蒸馏水进行六次连续洗涤，然后分析渗滤液中的主要阴离子和重金属。第一次洗涤等分试样中主要是磷酸盐（980 mg / L）和氯化物（760 mg / L）的含量增加，而硝酸盐，硫酸盐，氟化物和溴化物的含量则较低，随着洗涤的进行而降低。多数阴离子经过3次洗涤后观察到零浓度。第一次洗涤等分试样中测定的Zn，Be，Cs，Mn，V和Se含量增加，在随后的洗涤中被消除。每次洗涤等分试样的毒性，由仙虾的使用决定Thamnocephalus platyurus显示第一和第二MSR生物炭浸出液分别具有4.52和1.46毒性单位（TU）的毒性，然后在进一步洗涤后显着消除了毒性。