耐火陶瓷纤维粉尘质量浓度与纤维计数浓度的关系

Relationship between dust mass concentration and fiber number concentration of refractory ceramic fibers

目的 探讨耐火陶瓷纤维粉尘质量浓度与纤维计数浓度之间的定量换算关系.方法 选择耐火陶瓷纤维典型企业作为研究现场,采用定点长时间方式平行采集总粉尘质量浓度和纤维计数浓度样品53对.总粉尘质量浓度按GBZ/T 192.1-2007《工作场所空气中粉尘测定第1部分：总粉尘浓度》进行测定,纤维计数浓度采用滤膜/相差显微镜法进行测定.对两种浓度及其比值分别进行单变量分析,两种浓度相关分析采用Spearman等级相关,并拟合线性回归、对数曲线、多项式、幂函数、指数曲线模型.结果 总粉尘质量浓度（x）范围0.45～13.82 mg/m3,纤维计数浓度（y）范围0.01～ 1.04 f/ml,两者比值（x/y）范围4～158,三者均不服从正态分布（均P＜0.01）.两种浓度呈正相关关系（rs=0.705 22,P＜0.0001）,所拟合线性回归、对数曲线、多项式、幂函数和指数曲线模型的决定系数（R2）均较低,决定系数最高的是三项式曲线模型y=-0.001 1x3＋0.0104χ2＋0.1014x-0.055 1（R2=0.684 8）.结论 耐火陶瓷纤维的纤维计数浓度虽与总粉尘质量浓度呈正相关,但两种浓度之间无固定的回归关系,两者之间难以获得较稳定的转换系数,两种浓度相互不能替代.

Objective To explore the quantitative relationship between the dust mass concentration and fiber number concentration of refractory ceramic fibres.Methods A typical refractory ceramic fiber plant was selected as the study site.Fifty-three paired samples of total dust mass concentration and fiber number concentration were collected using the long-time fixed site mode.The total dust mass concentration was measured according to the GBZ/T 192.1-2007 （Measurement of dust in the air of workplace,part 1：Total dust concentration）.Membrane filter method/phase-contrast optical microscopy was used to determine the fiber number concentration.Univariate analysis was used to describe the distribution of the two concentrations and their ratio.Spearman rank correlation,as well as linear regression,logarithmic curve,polynomial,power function,and exponential curve model,were used to explore the relationship between the two concentrations.Results The range of the total dust mass concentration （x） was 0.45～13.82 mg/m3.The range of the fiber number concentration （y） was 0.01-1.04 f/ml.The range of the ratio （x/y） was 4～158.All of the three parameters did not follow normal distribution （P〈0.000 1）.The two concentrations showed a positive correlation （rs=0.705 22,P〈 0.000 1）.All the coefficients of determination （R2） of linear regression,logarithmic curve,polynomial,power function,and exponential curve model were relatively low.The trinomial curve model had the highest R2 （0.6848） and the fitted equation was y=-0.001 1x3＋0.010 4χ2＋0.101 4x-0.055 1.Conclusion There is a positive correlation between the total dust mass concentration and fiber number concentration of refractory ceramic fibers.However,there is no fixed regression relationship between the two concentrations,and neither is a definite coefficient which can be used to convert each other.The two concentrations cannot be replaced by each other.