Stopford C M, Stopford W
Hillsborough, North Carolina 27278, USA.
Scand J Work Environ Health. 1995;21 Suppl 2:44-6.
Sandy-loam soils from six active farms in the coastal plains of North Carolina (USA) were analyzed for aerodynamic equivalent diameter and quartz content and compared with results to similar analyses of clay soils of the Piedmont and sandy soils from the sand hills of North Carolina to see whether respirable quartz content varies with soil type. The respirable fraction of sandy loam-soils averaged 0.04 (SD 0.02) versus 0.13 (SD 0.03) for clay soils and 0.04 (SD 0.03) for sandy soils. Quartz content in the 4.25 mu m fraction of sandy-loam soils averaged 15.2 (SD 4.1) % versus 2.2 (SD 0.8) % in clay soils and 29.0 (SD 11.1) % in sandy soils. The mass of respirable quartz in sandy-loam soils averaged 0.7 (SD 0.4)% versus 0.3 (SD 0.1)% in clay soils and 1.0 (SD 0.4) % in sandy soils. These results suggest that, during dusty farm activities, there is a potential for greater respirable quartz exposures associated with work with sandy or sandy-loam soils than from work with clay soils.
对美国北卡罗来纳州沿海平原六个活跃农场的沙壤土进行了空气动力学等效直径和石英含量分析，并将结果与皮埃蒙特粘土土壤以及北卡罗来纳州沙丘沙质土壤的类似分析结果进行比较，以了解可吸入石英含量是否随土壤类型而变化。沙壤土的可吸入部分平均为0.04（标准差0.02），而粘土土壤为0.13（标准差0.03），沙质土壤为0.04（标准差0.03）。沙壤土4.25微米部分的石英含量平均为15.2（标准差4.1）%，而粘土土壤为2.2（标准差0.8）%，沙质土壤为29.0（标准差11.1）%。沙壤土中可吸入石英的质量平均为0.7（标准差0.4）%，而粘土土壤为0.3（标准差0.1）%，沙质土壤为1.0（标准差0.4）%。这些结果表明，在尘土飞扬的农场活动中，与沙质或沙壤土作业相比，粘土作业导致可吸入石英暴露的可能性更大。
