LIU Xiao-zheng,XU Cheng-jun.Determination of Nine Metal Elements in Oily Wastewater by ICP-OES with Automatic Digestion[J].China Water & Wastewater,2021,37(10 10):164.
Determination of Nine Metal Elements in Oily Wastewater by ICP-OES with Automatic Digestion
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
10 10
Page:
164
Column:
Date of publication:
2021-05-17
- Abstract:
- Wastewater discharged from oil production plant sometimes contains oil, which makes it difficult to be pre-treated and detected. A set of sample pretreatment procedures and detection method were thus designed. The oil-containing wastewater was treated by an automatic digester. The temperature rising procedure was as follows: collecting 25 mL water sample, adding 3 mL pure HNO3 and heating the sample at 120 ℃ for 30 min; lifting the digestion tube and cooling it for 10 min; adding 3 mL pure HClO4 at 150 ℃ and heating it for 30 min; lifting the digestion tube and cooling it for 10 min; heating the sample to 160 ℃ near completely dry; after cooling, using 1% HNO3 to fix the volume to 25 mL. The treated water samples were analyzed by inductively coupled plasma emission spectrometry (ICP-OES) with detection wavelength between 206.2-357.9 nm. The observation method was as follows: radial of total barium, axial of other elements and the emission power of 1 500 W. The results showed that the linear relationship of 9 metal elements (copper, zinc, lead, cadmium, nickel, iron, manganese, chromium and barium) was good in the range of 0.00-1.00 mg/L. The value of r was larger than 0.995, detection limit was 0.003-0.062 mg/L, the recovery rate of oilcontaining wastewater sample was 84.2%-113.2% and relative standard deviation (RSD) was 0.49%-2.86%. The method has the advantages of little harm to human body, simple operation, high accuracy and precision, which can be used for the determination of 9 metal elements in oily wastewater.
Last Update:
2021-05-17