The Determination Of 8 Heavy Metals In Textile Dyeing And Finishing Auxiliaries With ICP-AES

Heavy metals exhibiting a certain amount of toxicity can be accumulated in the human body, which widely exist in daily consumer goods and our environment. For the better function and the excellent comfort and appearance of textiles, a variety of heavy metals also be mingled in textile auxiliaries. As a result, if the heavy metals content are above the national standards that will affect our health. In addition, an abundant of wastewater will be generated in the whole manufacturing process, which pollutes local water sources and soils and further damage our environment.To curb the pollution of heavy metals, the laws and regulations both in China and abroad have promulgated, in which heavy metals in daily consumer goods such as textiles are strictly controlled in a reasonable range. The textile dyeing and finishing auxiliaries are indispensable in modern textile industry. Therefore, heavy metals detection and lessening become particularly important for our environment and our health.At present, soil, plants, paint and other heavy metals content in a variety of material test have been wildly researched.In addition, the extraction volume and total content of heavy metals in textile products have been expressly stated by the legislature in China, America and Europe. However, there is no feasible method completely suitable for the heavy metal testing in the textile dyeing and finishing auxiliaries. Thus, it’s rather necessary to establish a common method. It will be helpful to control the pollution at the source and ensure the safety of ecological textiles and our environment.In this thesis, the differences of pre-processing methods including traditional wet digestion and modern microwave digestion were compared. The method for the determination of heavy metals in textile dyeing and finishing auxiliaries by inductively coupled plasma-atomic emission spectrometry (ICP-AES) was developed. The main contents are as follows:1. In order to be applied to the multiforms of textile auxiliaries, pretreatment process is optimized according to the common wet digestion method. The advantage of this method is low equipment condition, but requires long pre-treatment time and a large amount of reagents. This is also harmful to environment and human body. Importantly, the pretreatment result is not ideal.2. Based on the common microwave digestion method of the material, the digestion conditions of the textile auxiliaries are optimized according to the characteristics of the textile auxiliaries. A pretreatment process for the detection of heavy metals in textile auxiliaries is established. Nitric acid, hydrogen peroxide and fluoride boric acid are necessary at 195 ℃ for 20mins using microwave digestion instrument. Of particular note is without hydrofluoric acid, which must be heated to dislodge if existed in the solution.3. ICP-AES can determine multi elements at the same time. It contributes to establish rapid, accurate determination method for several heavy metal elements in textile auxiliaries. Eight heavy metal elements in textile auxiliaries can be detected in both qualitative and quantitative criteria by ICP-AES. The limit of quantification of this method is basically lower than 10 mg/kg, which completely conform to National standard for heavy metals in textile auxiliaries. The linear correlation coefficient is more than 0.999, and the recovery and precision are appropriate. All of these conditions meet requirements of eight heavy metal elements in textile auxiliaries. It fills the blanks of the method for detecting heavy metals in textile auxiliary.