Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity

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	Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity
	Li, Quanlong ; Wang, Fengzhen ; Wang, Zhaohui Aleck ; Yuan, Dongxing ; Dai, Minhan ; Chen, Jinshun ; Dai, Junwei ; Hoering, Katherine A. ; Li QL(李权龙) ; Yuan DX(袁东星) ; Dai MH(戴民汉) ; Chen JS(陈进顺)
刊名	http://dx.doi.org/10.1021/es402421a
	2013
关键词	TOTAL INORGANIC CARBON CORE WAVE-GUIDE PH MEASUREMENTS IN-SITU PCO(2) SENSOR SEA INDICATORS WATERS CO2
英文摘要	High-Tech Research and Development Program of China [2007AA09Z127]; An automated analyzer was developed to achieve fast, precise, and accurate measurements of seawater total alkalinity (A(T)) based on single-point titration and spectrophotometric pH detection. The single-point titration was carried out in a circulating loop, which allowed the titrant (hydrochloric acid and bromocresol green solution) and a seawater sample to mix at a constant volume ratio. The dissolved CO2 in the sample-titrant mixture was efficiently removed by an inline CO2 remover, which consists of a gas-permeable tubing (Teflon AF2400) submerged in a sodium hydroxide (NaOH) solution. The pH of the mixture was then measured with a custom-made spectrophotometric detection system. The analyzer was calibrated against multiple certified reference materials (CRMs) with different A(T) values. The analyzer features a sample throughput time of 6.5 min with high precision (+/- 0.33-0.36 mu mol kg(-1); n = 48) and accuracy (-0.33 +/- 0.99 mu mol kg(-1); n = 10). Intercomparison to a traditional open-cell A(T) titrator showed overall good agreement of 0.88 +/- 2.03 mu mol kg(-1) (n = 22). The analyzer achieved excellent stability without recalibration over 11 days, during which time 320 measurements were made with a total running time of over 40 h. Because of its small size, low power consumption requirements, and its ability to be automated, the new analyzer can be adapted for underway and in situ measurements.
语种	英语
出版者	AMER CHEMICAL SOC
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87950]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Li, Quanlong,Wang, Fengzhen,Wang, Zhaohui Aleck,et al. Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity[J]. http://dx.doi.org/10.1021/es402421a,2013.
APA	Li, Quanlong.,Wang, Fengzhen.,Wang, Zhaohui Aleck.,Yuan, Dongxing.,Dai, Minhan.,...&陈进顺.(2013).Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity.http://dx.doi.org/10.1021/es402421a.
MLA	Li, Quanlong,et al."Automated Spectrophotometric Analyzer for Rapid Single-Point Titration of Seawater Total Alkalinity".http://dx.doi.org/10.1021/es402421a (2013).