Oil and Grease Measurement in Highway Runoff—Sampling Time and Event Mean Concentrations
Oil and Grease Measurement in Highway Runoff—Sampling Time and Event Mean Concentrations
复制标题
公路径流中的油和油脂测量——采样时间和事件平均浓度
DOI：
10.1061/(asce)0733-9372(2006)132:3(415
复制
发表时间：
2006
影响因子：
2.2
通讯作者：
M. Stenstrom
中科院分区：
文献类型：
--
作者：
Sabbir Khan;S. Lau;M. Kayhanian;M. Stenstrom
事件平均浓度（EMC），通常收集与自动，流量加权复合采样器，经常被用来表征雨水污染物。不建议使用自动采样器采集油和油脂（O&G）样品，因为与管道和泵的相互作用可能会产生偏差。为了测量EMC而不受采样器干扰，必须沿着流量测量收集一系列抓取样本（通常超过十个样本），以计算EMC。本文探讨了22 O&G污染图从小，不透水的公路网站，以确定当一个单一的O&G抓斗样本最接近的流量加权复合样本。在风暴事件的第一个小时内收集的样本高估了O&G EMC 20 mg scinL或更多，而在事件结束时收集的样本低估了EMC。最好的时间收集一个单一的抓斗样品的范围从1到6小时后开始径流，并与现场或风暴的具体因素。结果从th…
An event mean concentration (EMC), usually collected with an automatic, flow-weighted composite sampler, is often used to characterize stormwater pollutants. Automatic samplers are not recommended for collecting oil and grease (O&G) samples due to possible biases associated with interactions with tubing and pumps. To measure the EMC without sampler interferences, a series of grab samples (often over ten samples) must be collected along with the flow measurement to compute the EMC. This paper examines 22 O&G pollutographs from small, impervious highway sites, to determine when a single O&G grab sample most closely approximates a flow-weighted composite sample. Samples collected within the first hour of a storm event overestimated the O&G EMC by 20 mg∕L or more, while samples collected toward the end of the event underestimated the EMC. The best time to collect a single grab sample ranged from 1 to 6 h after the beginning of runoff, and was related to site or storm-specific factors. Results obtained from th...