Environmental Metrology and Policy Program, Graduate School of Arts and Sciences, Georgetown University, Washington, DC, 20057, USA.
National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
Sci Rep. 2023 Aug 24;13(1):13877. doi: 10.1038/s41598-023-38574-z.
Whether a tire crumb rubber (TCR) playground would expose children to potentially harmful chemicals such as heavy metals is an open question. The released metals available for pickup on the surface of TCR tiles was studied by accelerated 2-year aging of the TCRs in the NIST-SPHERE (National Institute of Standards and Technology Simulated Photodegradation via High Energy Radiant Exposure). The dermal contact was mimicked by a method of composite surface wiping from US Environmental Protection Agency throughout the weathering process. The surface release of ten most concerned harmful metals (Be, Cr, Cu, As, Se, Cd, Sb, Ba, Tl, Pb) was monitored through the course of aging. The cumulative release of Cu, As, Tl, and Sb reached potentially harmful levels at various times within 3 years, although only Cr was found at a harmful level on the surface of the tiles. Taking the cleansing effect of precipitation or periodic cleansing with rain into account, TCR playgrounds may still be safe for use.
轮胎胶粉（TCR）操场是否会使儿童接触到重金属等潜在有害物质是一个悬而未决的问题。通过在 NIST-SPHERE（美国国家标准与技术研究院通过高能辐射模拟光降解）中加速 TCR 老化 2 年来研究 TCR 地砖表面可收集的释放金属。通过美国环境保护署（EPA）的复合表面擦拭方法模拟皮肤接触，在整个风化过程中进行。通过老化过程监测十种最受关注的有害金属（Be、Cr、Cu、As、Se、Cd、Sb、Ba、Tl、Pb）的表面释放情况。Cu、As、Tl 和 Sb 的累积释放量在 3 年内的不同时间达到了潜在的有害水平，尽管仅在瓷砖表面发现 Cr 达到了有害水平。考虑到降水的清洁作用或定期用雨水进行清洁，TCR 操场仍可安全使用。
