《Table 2Detection results and recovery rate of samples by isonicotinic acid pyrazolone spectrophotom

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《Detection of Cyanide in Pollution-free Livestock Product Breeding Water by Ion Chromatography》

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We took test sample 17JCS004 and detected by the ion chromatography and the isonicotinic acid pyrazolone spectrophotometry 6 times，and detection results were listed in Table 2.Compared with the ion chromatography，the isonicotinic acid pyrazolone spectrophotometry has more complex analysis procedure，more influencing factors，so it easily brings human error.Through comparison experiment，cyanide in pollution-free livestock product breeding water had lower relative standard deviation by the ion chromatography than the isonicotinic acid pyrazolone spectrophotometry，and the recovery rate was higher and detection results had higher accuracy；the limit of detection of the isonicotinic acid pyrazolone spectrophotometry was 0.004 mg/L（GB/T5750.5-2006），while the limit of detection of the ion chromatography was 0.001 mg/L，so the ion chromatography is more suitable for detection of cyanide than the isonicotinic acid pyrazolone spectrophotometry.