the amount of extractable organic matter in road dusts, gully sediments and tunnel ceiling dusts from hong kong are significantly higher than that from guangzhou.
香港路尘、下水道积尘和隧道烟尘中有机质含量分别显着高于广州路尘、下水道积尘和隧道烟尘中有机质含量。
triassic black mudstones are extensively distributed in tarim basin with great thickness and higher content of total organic matter (toc) and extractable organic matter (eom).