離心分離轉(zhuǎn)速和時間對氨氮測定結(jié)果的影響

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中圖分類號X830.5 文獻標(biāo)識碼A 文章編號 1007-7731(2025)14-0084-04

DOI號 10.16377/j.cnki.issn1007-7731.2025.14.018

Influence of centrifugal separation speed and time on the determination of ammonia nitrogen

ZHU Chunxiang

(Ecological Environment Monitoring Station of Shucheng County,Lu'an 2313Oo, China)

AbstractTo investigate theeffctsofcentrifugal separationspeedand timeonthedeterminationresultsof ammonianitrogen,referring totheHJ535-20o9 Water QualityDeterminationofAmmoniaNitrogenNesler'sReagent Spectrophotometry,4 rotational speeds(1 000,2 000,3 000,and 4000r/min ）and 6 time durations(1,2,3,4,5 and 6 min)were set,totaling 24 treatments.The absorbance values of water samples with diferent turbidities (4.1,18 and 30 NTU) were measured,and Grubbs’one-sided test was used for mean value testing.The spike recovery rates under optimal treatment conditions were calculated.Meanwhile,the effects of 4 pretreatment methods raw water, centrifugal separation,flocculation precipitation,and flocculation precipitation + centrifugal separation on the ammonia nitrogencontentofthe watersamples were compared.The results showed that the minimum absorbance values for the 3 water samples with turbiditiesof 4.1,18and30NTU were 0.183,0.091andO.102,respectively,allcorresponding toa rotational speed of 4 OoO r/min and a time of 4 min.The mean test values G6 for time were1.563,1.280,and1.524,and the mean test values were 1.258,1.333,and 1.147,respectively. The spike recovery rates for the 3 water samples pretreated with flocculation precipitation + centrifugal separation (4 Ooo r/min, 4 min) ranged from 98% to 102% . The ammonia nitrogencontentof the same water sample,as determined bythe four diffrent pretreatment methods,ranked fromhigh to low as follows:raw water > centrifugal separation > flocculation precipitation > flocculation precipitation + （204 centrifugal separation.Thecomprehensiveresultsindicate that the pretreatment method combining flocculation sedimentationand centrifugal separation demonstrates optimal effctiveness inremoving turbidityinterference for ammonia nitrogen measurement.Under the experimental conditions of this study,therecommended centrifugation parameters are 4000r/min for 4 minutes.

Keywordsflocculation and sedimentation; centrifugal separation; ammonia nitrogen; turbidity

氨氮作為水環(huán)境和生活、養(yǎng)殖、工農(nóng)業(yè)生產(chǎn)廢水中的重要檢測指標(biāo)之一，主要以游離態(tài)氨或銨離子形態(tài)存在。（剩余6956字）