自来水中氯酸盐离子的离子色谱法

氯酸（氯酸氢）是一种强氧化剂，是由二氧化氯和次氯酸钠衍生出来的分解产物，用作水澄清的消毒剂。我们研究了离子色谱法对分离和测定该化合物的有效性。本实验中使用的系统是JASCO 2000 Plus系统，由PU-2080泵、DG-2080-53流动相脱气器、CO-2060柱烘箱、AS-2057自动采样器、CD-5电导率检测器（Shodex）、离子抑制器模块和ChromNAV色谱数据系统组成。将该方法应用于自来水的分析。将水（1L）与0.5%乙二胺（1mL）混合，然后用0.2µm膜过滤器过滤。注射50µL或100µL的等分试样。Application Note 2/2Ion Chromatography of Chlorate lons in Tap WaterApplication Note Ion Chromatography of Chlorate lons in Tap Wate r In t roduct i on C hl or i c acid (Hyd r ogen chlo r at e )， a s tr ong oxidiz i ng ag e n t ， occurs as a d e com p osi ti on p roduct der i ved f rom c hl orine d i ox i de and sodium hypochlo rit e whic h are used as a d i sinfectant fo r wate r clari f ica ti on. We examined the us ef uln ess o f io n c h roma t ogra p hy fo r t h e s ep a r at i o n a n d de t er m i n a tio n of t hi s c o mp o un d Experime n ta l Th e sys t em ut i li zed in t his expe r im ent was a JASCO 2000P l us sys t em co n sist ing of a PU -2080 pump， DG -2080-53m o b i le p hase d eg asse r ， CO -2060 column oven， A S -2057auto sa mpl er， CD -5 cond u c t i vit y d etec t or(Shodex)，a n i on su p p r essor mo dul e， a nd C hr o m NAV chromato graph y d a t a syst em . T he me thod w a s appli e d t o the an al ysis of t ap w ate r .T h e water (1 L) was mi xed with 0.5% e th y l ened i amine (1 m L )， and then f i lt er ed with 0.2 um m em b r a ne fil t er.An a li q u ot of 50 u L or 100 pL was inj ected . J a s c o LC 2000 Ser i es R esul t s a n d Dis cu ssi o n F i gure 1 sh o ws a c h ro m a t ogram of a sta n d ard mixture o f 10 a nion s . Res o lut i o n between Peak 7 (c h l o rate i o n) an d neighbor i ng Pea k 6 (bromide i on ) exhibi t s gre a ter tha n 2. T h ere was no overl a ppi n g b e t ween t h e s e t wo pe a ks with any d i ffer e nt co n c e n tr atio n s， r esult i ng in precise de te r m i n at io n. Mi ni mum d e te c t a b l e a m o un t s proved 18.9 ppb (1.89 n g) at S/N=10， a n d 5.7 p pb (0.57 ng) a t S/N=3. T he cal i b r a tio n c u rv e of chlorate io n i nd i cated linearity between 5 ppb and 1 ppm with a co e f f icient of cor r e latio n of 1.000. Repet i tiv e i njectio n (n = 5) of 10 ppb solut i on of 100 p L provided r elative sta n dard deviation o f 3.79%. Figure 1. Chromatogram of a standard mixture of 10 anions. Peaks： 1 = f luoride (f ， 2 ppm)， 2 = ch l orite (CIO，， 1 ppm)， 3= bromate (BrO，，1 ppm )， 4 = chloride (CI， 10ppm)， 5 = n i tr i te (NO，， 5 ppm)， 6 = bromide (Br ，10 ppm)，7 = chlorate (ClO ，1 ppm)， 8 = nitrate (NO ，30ppm)， 9 = phosphate (PO 3， 15 ppm)， 10 = sulfate (SO 2， 40 ppm) Chromatographic conditions： col u mn =Shodex IC SI-52 4E (4.6 mm ID x 250 mmL)； column temperature=45℃； mobile phase = 3.6 mM Na ，CO，；flow rate=0.8 mL/min； inject i on volume=50 pL. Figure 2 shows a chromatog r am of t he tap water mixed w i t h chlor i c acid (60 ppb). Ch l orate i on (Peak 3)i s separa t ed clea r ly from ot h er peaks. Figure 2. Chromatogram of the tap water mixed with chloric acid (60 ppb.) Peaks： 1 = chlorite (CIO，)， 2 = chloride (CF)， 3=chlorate (CIO ，)， 4 = nitrate (NO )， 5 = sulfate (SO 2)The other condit i ons are the same as in F i gure 1 caption.