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首页> 外文期刊>Journal of Environmental Science and Health >Assessment of methods for collecting fallout brake pad wear debris for environmental analysis
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Assessment of methods for collecting fallout brake pad wear debris for environmental analysis

机译：评估用于环境分析的沉降式刹车片磨损碎片的收集方法

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Three methods for collecting or generating fallout brake pad wear debris for environmental analysis were assessed: collection from wheels or hubs of automobiles (natural), generation from an inexpensive sanding process (sanded), and collection of fallout debris from dynamometer tests using the Los Angeles City Traffic protocol (LACT). Brake wear debris was collected from four automobiles with semimetalic brake pads and analyzed for physicochemical properties. For automobiles where all three types of debris were collected, bulk copper mass fractions ranged from 22-23% in sanded particles and 24-27% in LACTparticles, but were reduced to 1-6% in natural debris. The smaller copper mass fraction in natural debris was attributed to contamination with road dust, which was found to comprise 37-97% of the natural particles. The ratio of surface to bulk copper mass fraction was up to five times larger for natural than LACT debris, suggesting that copper may leach into stormwater faster and to a greater extent for natural particles. While the LACT method appears best for collecting only fallout particles, significant differences in copper distributions in the natural and LACT debris suggests that metal distribution in LACT debris may not be representative of fallout particles generated under actual driving conditions, where airborne road dust may play a role. Although dynamometer tests have been the preferred method for generating debris for assessment of metal dissolution from brake particles, data from this study indicate that such samples may result in biased estimates of metal leaching.
机译：评估了三种收集或生成用于环境分析的沉降式刹车片磨损碎片的方法：从汽车的车轮或轮毂收集（天然），通过廉价的打磨过程生成（打磨），以及使用洛杉矶的测力计收集沉降的碎片城市交通协议（LACT）。从四辆带有半金属制动片的汽车上收集了制动磨损碎片，并对其理化性质进行了分析。对于收集了所有三种残渣的汽车，散装铜的质量分数范围从砂粒中的22-23％和LACT粒子中的24-27％不等，而在天然残渣中则降低至1-6％。天然残渣中较小的铜质量分数归因于道路灰尘的污染，发现该灰尘占自然颗粒的37-97％。天然铜表面质量分数与散装铜质量分数之比比LACT碎片大五倍，这表明铜可能更快地浸入雨水，而天然颗粒的浸出程度更大。虽然LACT方法似乎最适合仅收集沉降颗粒，但天然和LACT碎屑中铜分布的显着差异表明，LACT碎屑中的金属分布可能不代表实际驾驶条件下产生的沉降颗粒，在这种情况下，空中尘土可能起着角色。尽管测功机测试已成为用于生成碎片以评估金属从制动颗粒中溶解的首选方法，但这项研究的数据表明，此类样品可能会导致金属浸出的估计偏差。

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