An analytical method for the determination of molybdenum in the end fitting of PE flexible composite pipe

Abstract

The flexible composite pipe is a new type of polymer composite pipe with excellent corrosion resistance. Based on the color reaction of molybdenum with sodium thiocyanate, a photometric method for the determination of molybdenum in flexible composite pipe joint samples was established. The sample is dissolved by a sulfuric acid-phosphoric acid mixed acid, and stannous chloride is used as a reducing agent in a sulfuric acid-perchloric acid medium, and an orange-red complex is formed between molybdenum and sodium thiocyanate, and the absorbance, absorbance and molybdenum content are measured in mass. The linear relationship is in the range of 0.30%∼1.18%. This method uses a standard steel solution closer to the real sample to establish a working curve. The experiment shows that the method is accurate and simple. The molybdenum in the end fitting of flexible composite pipe was measured, and the results were satisfactory.