基于参数法的织物中甲醛暴露点浓度控制上限估计

Calculating upper control limit for exposure point concentration of formaldehyde content in textiles by parametric method

为获取纺织品风险管理工作中甲醛残留浓度控制上限,随机抽取国产织物样品并对其甲醛含量进行测定。分别采用正态分布、对数正态分布及Gamma分布对样本数据进行拟合,拟合优度结果显示数据分布形态更接近对数正态分布。采用最大概似估计(MLE)的Land方法及最小方差无偏估计(MVUE)的Chebyshev方法计算得到甲醛暴露点浓度控制上限(UCL),分别为35.18、41.82 mg/kg。

To establish the upper control limit （UCL） for formaldehyde residue in textile matrix in the process of risk management, content of formaldehyde of textile samples collected randomly in domestic market was determined. Data distribution was fitted by 3 commonly used functions, i.e., normal, Lognormal and Gamma;goodness-of fit of results shows that lognormal function is best fitted data distribution. Upper control limit for exposure point concentration of formaldehyde was calculated by Land method based on maximum likelihood estimates （MLEs） and Chebyshev method based on minimum variance unbiased estimates （MVUEs）, and UCL values were 35.18 mg/kg and 41.82 mg/kg, respectively.