Add time:08/19/2019         Source:sciencedirect.com

Improvements are described for the 2,4-Xylenol (cas 105-67-9) spectrophotometric method for nitrate that reduce the elapsed and working time. Diluted (22 + 3) sulfuric acid is added quickly to the sample solution while the flask is immersed in tap water. 2,4-xylenol solution is added, the 6-nitro-2,4-xylenol formed is steam-distilled into a composite ammonia—isopropanol reagent, and the absorbance of the ammonium salt of 6-nitro-2,4-xylenol is measured. Further possible interferences are described. Br2, I2, ClO-, CIO3-, BrO3-, and I04-, cause low results by deactivating or destroying the 2,4-xylenol. Azide, hydrazine, and elemental carbon cause low results by reducing the nitrate in the strong sulfuric acid solution. Se+ causes low results because 2,4-xylenol is consumed in reducing Se4+ to the element. Pt4+ and Os8+ cause high results. Interferences from Br2, I2, ClO-, ClO3- lO3-, and I04- can be eliminated by reduction to the halide with sulfurous acid and precipitation with silver sulfate. Sulfurous acid reduction also eliminates interferences from V5+. Mn7+, Cr6+, S2O82-, and H202. Interferences from N3-, Br2, I2, and S2082- are eliminated merely by boiling a 0.5% sulfuric acid solution for 30 min (and precipitating any residual halide with silver sulfate).

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