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dc.contributor.authorPhansi, Piyawanen_US
dc.contributor.authorปิยวรรณ พันสีen_US
dc.contributor.authorKoin, Jantiraen_US
dc.contributor.authorจันทิรา กออินทร์en_US
dc.contributor.authorNacapricha, Duangjaien_US
dc.contributor.authorดวงใจ นาคะปรีชาen_US
dc.date.accessioned2021-08-07T07:52:50Z
dc.date.available2021-08-07T07:52:50Z
dc.date.issued2021-08-07
dc.identifier.issn2651-1096
dc.identifier.urihttp://repository.rmutp.ac.th/handle/123456789/3606
dc.descriptionวารสารวิชาการและวิจัย มทร.พระนคร, ปีที่ 14, ฉบับที่ 2 (ก.ค.-ธ.ค. 2563), หน้า 122-134en_US
dc.description.abstractA simple flow injection analytical system for an automatic determination of phosphate in water samples using the molybdenum blue method was developed. Samples were injected and mixed with ascorbic acid used as a reducing agent. The absorbance of the resulting molybdenum blue complex was measured at 880 nm by a spectrophotometer. The optimal conditions of this system were 2 mL/min of carrier flow rate, 1,000 μL of sample volume, 60 centimeters of mixing tube length, and 0.020 mol/L of ascorbic acid. The proposed method showed reliability, high sensitivity, spend small amount of reagents and samples, and fast sample throughput (52 samples/hour). The limit of detection (LOD) was 0.015 mg P/L of phosphate. Precision obtained injecting a phosphate standard solution of 0.50 mg P/L (n=10) was 1.81%. This system can be applied to determination of phosphate content in surface water samples in Lopburi province by comparing with a standard method. It was found that obtained from the developed system agreed well with the standard method using the pair t-test (tstat 0.04 < tcrit 2.36). This flow injection analysis system has no effect from arsenate and silicate interference for the analysis of natural water samples.en_US
dc.description.sponsorshipRajamangala University of Technology Phra Nakhonen_US
dc.language.isothen_US
dc.subjectPhosphatesen_US
dc.subjectฟอสเฟตen_US
dc.subjectWater -- Analysisen_US
dc.subjectน้ำ -- การวิเคราะห์en_US
dc.subjectWater -- Samplingen_US
dc.subjectน้ำ -- การสุ่มตัวอย่างen_US
dc.subjectWateren_US
dc.subjectน้ำen_US
dc.titleDetermination of phosphate in surface water of lopburi province using a simple flow injection analytical systemen_US
dc.title.alternativeการตรวจวัดปริมาณฟอสเฟตในน้ำผิวดินจังหวัดลพบุรี ด้วยระบบวิเคราะห์แบบไหลชนิดโฟลอินเจคชันอย่างง่ายen_US
dc.typeJournal Articlesen_US
dc.contributor.emailauthorpphansi@gmail.comen_US
dc.contributor.emailauthorarit@rmutp.ac.then_US


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