Primary Production Department, Istituto Zooprofilattico Sperimentale della Lombardia e dell'Emilia Romagna "Bruno Ubertini", Via Bianchi, 9, 25124, Brescia, Italy.
Environ Sci Pollut Res Int. 2015 Jul;22(13):9775-85. doi: 10.1007/s11356-015-4146-y. Epub 2015 Feb 1.
Milk supplied to a dairy plant in Brescia City (Northern Italy) was found to be contaminated by dioxin like PCBs at levels above the European (EU) action limit (2 pg WHO-TEQ/g fat). As a consequence, 14 dairy farms were sampled individually, in order to identify and possibly eliminate the source of contamination. All the farms were located in Brescia or just nearby, an area that is characterized by a strong industrialization. Four out of the 14 farms showed contamination levels above the legal maximum limit set by European Commission at 5.5 pg WHO-TEQ/g fat for the sum of dioxins and DL-PCBs. Concentrations of 8.16, 6.83, 5.71 and 5.65 pg WHO-TEQ/g fat were detected. In the three most polluted farms, cow ration was substituted with feed coming from uncontaminated areas and the time needed to reduce milk pollution was evaluated. In all the three farms, contamination levels dropped below the EU legal limit after only 1 month from the removal of the pollution source. In each sampled farm, DL-PCBs were the major contributors to the total WHO-TEQ level, with percentages up to 87% in the most contaminated one. PCB 126 WHO-TEQ value explained by itself large part of this contamination, and its decrease was fundamental for the reduction of milk contamination levels. This study provides an example of an on-field successful emergency intervention that succeeded in decontamination of dairy cows, allowing a fast restart of their production activity.
布雷西亚市（意大利北部）的一家奶制品厂供应的牛奶被发现受到二恶英样多氯联苯的污染，其含量超过了欧洲（EU）行动限值（2 pg WHO-TEQ/g 脂肪）。因此，对 14 家奶牛场进行了单独抽样，以确定并可能消除污染来源。所有的农场都位于布雷西亚或附近，该地区以高度工业化而闻名。在这 14 家农场中，有 4 家农场的污染水平超过了欧洲委员会规定的 5.5 pg WHO-TEQ/g 脂肪的法定最高限量，即二恶英和 DL-PCBs 的总和。检测到的浓度分别为 8.16、6.83、5.71 和 5.65 pg WHO-TEQ/g 脂肪。在污染最严重的三个农场中，用来自未受污染地区的饲料替代了奶牛的饲料，并评估了减少牛奶污染所需的时间。在所有三个农场中，仅在去除污染源后 1 个月，污染水平就降至欧盟法定限值以下。在每个抽样农场中，DL-PCBs 是总 WHO-TEQ 水平的主要贡献者，在污染最严重的农场中，其比例高达 87%。PCB 126 WHO-TEQ 值本身就解释了这部分污染的大部分原因，其减少对于降低牛奶污染水平至关重要。本研究提供了一个现场成功应急干预的实例，成功地对奶牛进行了去污，使其生产活动能够快速恢复。
