Determination of Sulphur Dioxide in Air by Tri-O-Phenanthroline and Azulene-Sulfite-Potassium Persulphate Chemiluminescence

Analysis of sulfur oxides in air by chemiluminescence spectrophotometry with phenanthroline and potassium persulfate WU Fengwu, HE Zhike, MENG Hui, LUO Qingmin, ZENG Yunjun, College of Chemistry and Environmental Science, Wuhan University, Wuhan 430072, China. The concentration of sulfite and the chemiluminescence intensity are in the range of 1.75, 1071.25104,1. The relative standard deviation of the 9 detection limits of the 610941051 sulfite solution was 1.4. This method successfully measured sulfur oxides in air using ethanolamine as an absorbent.

1 Introduction Sulfites can be used as food preservative bleaches and are widely used in the food and pharmaceutical industries. Sulfur oxides are harmful pollutants in the atmosphere and are the main component of acid rain. There are many methods for its determination, such as spectrophotometric potentiometry2 and high performance liquid chromatography3. The chemiluminescence method is used for the determination of sulfite because of its high sensitivity and simplicity of operation. For example, riboflavin phosphate is used in 0, and cyclohexylamine is used as a sensitizer for chemiluminescence determination of sulfur oxides. Cardiac 1+ is also a chemiluminescent reagent. We have used its chemiluminescence method for the determination of oxalic acid and other organic acids. 6 The chemiluminescent properties of 5208 Oxidation 8 have been studied and used to determine sulfur oxides. Ethanolamine is a preferred sulfur oxide absorption solution 1. It is used to absorb sulfur oxides in the air and then measured by chemiluminescence, and satisfactory results have been obtained.

2 Experimental 2.1 Instruments 2.2 Reagents All solutions are analytically pure reagents and are prepared in hypo-distilled water. Weighing quantitative! 25,3 dissolved in water and formulated as a 0.0, stock solution. Weigh the quantification of this 32 laboratory synthesis reference document 7 dissolved and dubbed 2 103 stock solution. A quantitative amount of 5208 was weighed and dissolved in water, and a fixed volume of 1. was added. One of several 304 was assigned 0.0 to this 5208 stock solution. The stock solution was diluted with 1.01's 504 and water to a use solution. Weighed to 20, butane 66, 40, 180 and 00, respectively, 2.08 to dissolve the volume of water to 100 to 2. Weigh a quantitative amount of sodium decaylbenzene sulfonate 3083 bromodecapirine bromohexadecane The pyridine, 8 and cetylmethylammonium bromide 8 were dissolved in water and brought to a concentration of 0.01. Weigh 1, 8 ethanolamine 7 dissolved in water and set the volume to 100, the concentration of 1.0.

2.3 Experimental method Into the sample tube, place it in the testing room with a constant temperature of 25 ft. 51. Press the start key, 0.2, 3 still 1252, 80.05 café 1 504 automatic injection sample tube, the maximum luminous intensity under the print record value. At the same time, use distilled water to make a blank.

According to the luminous intensity of the calibration curve of the 80 concentration to determine the sample 3 to take 100. Human solution injection air sampling tube, with an air sampler at a rate of 1.0 to collect the air in the boiler room 2 after sampling, with 0. To make up to 10. The standard series was prepared with a solution of 0.

After the sample solution is mixed with different concentrations of the standard solution, the recoveries are determined.

3 Results Discussion 3.1 The influence of the concentration of Xiankou 6, +28208 and 804 on the luminescence intensity of the system. The 1+ concentration increases. Using this, 5 is 6+ to 5, with a wide linear range, so choose this concentration. When 51068, when present, the optimum concentration of 52,8 is 2.5 parent 4 虬, the optimal concentration of sulfuric acid is 1.25, 2 paws, 仉.

3.2 Effect of Surfactants In this experiment, the above eight kinds of surfactants were compared and studied. As a result, Mingyang 83 had the greatest reinforcing effect.

This is because the reaction product exists as a cationic complex in aqueous solution and is surrounded by an anionic surfactant 5083, which prevents quenching of chemiluminescence by water. Experiments show that the optimal concentration is 1.25,101.

3.3 Influence of other compounds It was found that the following concentrations of ions and solvents had little effect on the determination of the 251 valency of 80. The allowable concentrations of various ions and solvents were 4000 times he +, 2000 times, ribs 3,200 times elbow 28; 12 +02024. heart, 0.5 methanol ethanol acetonitrile.

3.4 Chemiluminescence reaction mechanism Since 30 can be oxidized to generate light 8 , for example, it can also be oxidized to generate light 6. In this experiment, for example, it is very high. The luminescence intensity is proportional to the concentrations of + and 80, respectively. Therefore, there may be two types of emitters in the system. The mechanism is detailed in the above literature.

3.5 calibration curve and detection limit moLL, i output limit of 61. The relative standard deviation of four, ten, and several 30 replicates is 1.4.3.6 Determination of sulfur oxides in air Several sulfur oxides are used to absorb sulfur oxides in air. For example, order 1, 12, citric acid, etc. However, they do not apply to this chemiluminescent system. This may be due to the fact that the luminescent reaction is carried out in an acidic medium, while the above-mentioned adsorbents Wu Fengwu et al. Phenanthroline combined with the sub-nail sulfite potassium persulphate chemiluminescence method to measure the oxidation of sulphur in the air after the 3 is oxidized . However, a high concentration of 1 solution will reduce the luminous intensity of the system. The 0.1 solution itself has a lower luminous intensity and has little effect on the luminescence of 30, so it is used as an absorbing solution. The gas sample was passed through a 0.17 absorption solution and a solution was used to prepare a standard series. The calibration curve was: = 22.83 + 8.5487 = 0.999961.75. 1071.2541 The sample was added and the recovery result was satisfactory. 1. The actual measurement of sulfur oxide in air was 59.6; 1.

Adding quantity, 6, Detection quantity 6 Mailer recovery rate 6 Set 26 He Zhike, Hehe 3 feet, 1 position 0 Ma Rongming, 0, 1 um 30 Luo Qing, 0 along 30 siumao, 761006 Zeng Shizhen.