Benzotrifluoride (BTF) and its derivatives (BTFs) were found in the groundwater of the Veneto region (Italy) as a result of industrial contamination dating back to the 1970s. In the first survey, BTF and 6 BTFs were identified, out of which 4-chloro-3nitrobenzotrifluoride (3N4CBTF) was the only quantified analyte (concentration up to 1 mg L^-1) and was used to trace the contamination plume. A survey carried out in 2008-2009 after the development of more suitable analytical procedures based on GC-MS, allowed to determine 4 new derivatives in addition to BTF and BTFs previously identified, with the most abundant compounds found at concentrations up to 11.9 μg L^-1 and 7.2 μg L^-1 respectively. A systematic monitoring program for the evaluation of persistence and distribution of fluorinated compounds was carried out in 2013-2018, and new data about the BTF and BTFs occurrence and distribution were gathered. Additional BTFs were identified and high concentrations of individual BTFs were recorded near the contamination source (e.g. 20.3 μg L^-1 of 4-chloro-3-nitrobenzotrifluoride in 2017) as well as at large distance (e.g. 22.4 μg L^-1 of 3N4CBTF and 12.5 μg L^-1 of 4-chlorobenzotrifluoride in 2018).

The results of BTFs monitoring campaigns carried out in 2008-2009 and 2017-2018 are compared and related to the historical data to assess the overall occurrence and distribution of BTFs contamination over a time range of ∼40 years. Remarkably, BTFs were still found (2018) at μg L^-1 range. Spatial and temporal occurrence of BTF and BTFs in groundwater has been assessed for the first time.

威尼托地区（意大利）的地下水中发现了三氟化苯（BTF）及其衍生物（BTF），这可追溯到1970年代。在第一次调查中，鉴定出了BTF和6种BTF，其中只有4-氯-3硝基三氟三氟甲烷（3N4CBTF）是唯一定量的分析物（浓度高达1 mg L ^-1），并用于跟踪污染羽流。在开发了更适合的基于GC-MS的分析程序后，于2008-2009年进行的一项调查，除先前鉴定的BTF和BTF外，还可以确定4种新的衍生物，其中最丰富的化合物的浓度高达11.9μgL ^-1和7.2μgL ^-1分别。2013-2018年，开展了一项系统的监测计划，以评估氟化物的持久性和分布，并收集了有关BTF和BTF发生与分布的新数据。确定了其他BTF，并在污染源附近（例如2017年的20.3μgL ^-1的4-氯-3-硝基三氟三氟甲烷）以及在较远的距离（例如3N4CBTF的22.4μgL ^-1和12.5微克L ^-1的4-氯三氟甲烷在2018年）。

比较了2008-2009年和2017-2018年开展的BTFs监测活动的结果，并将其与历史数据进行关联，以评估40多年来BTFs污染的总体发生和分布。值得注意的是，仍然发现（2018）BTF在μgL ^-1范围内。首次评估了地下水中BTF和BTF的时空分布。