Abstract:There are diferences in the process of drawing calibration curve and sample determination in water environment detection methods. Taking the determination of cyanide as an example, this paper shows the process of correcting the resulting systematic error by using the determination rate to improve the accuracy of the detection result.The results show that the rate reduction method is effective for the determination of cyanide in water by HJ484-2009spectrophotometry, and the accuracy of the detection is effectively improved after reduction.