NDLI: Development of an in-situ total phosphorus analyzer

Content Provider	IEEE Xplore Digital Library
Author	Taylor, Elysia Bonner, James Nelson, Russell Fuller, Christopher Kirkey, William Cappelli, Stephanie
Copyright Year	2015
Description	Author affiliation: Dept. of Civil and Environmental Engineering, Clarkson University, Potsdam, NY, United States (Taylor, Elysia; Bonner, James; Nelson, Russell; Fuller, Christopher; Kirkey, William; Cappelli, Stephanie)
Abstract	A low cost autonomous, in-situ analyzer for orthophosphate and total phosphorus was developed and tested for near real time monitoring in aquatic and marine environments. The system applies the colorimetric stannous chloride-molybdenum blue method following oxidative digestion with acidic peroxodisulfate. A (fluorinated ethylene propylene) FEB tubing reactor coil is wrapped around a germicidal UV (254nm) light to accelerate the digestion reaction. A Nickel chromium wire (NiCr) wound between reactor coil wraps provides controlled heating for digestion. Reactor temperature is monitored continuously with a small temperature probe and controlled with a PID. A sequential injection analysis (SIA) method was chosen where the analyzer operates as a sequential batch reactor. Water sample and reagents are delivered through the microfluidics using syringe pump driven by linear actuators that are controlled with a Teensy microprocessor. To equalize pressures, reagent storage and waste are contained in collapsible reagent bags maintained at hydrostatic pressure outside the submersible housing. Following digestion and colorimetric reactions the sample is transferred to flow cell (5 cm path length) where a photodiode measures sample absorbance at 600 nm. For orthophosphate phosphorus measurements, the sample is not treated with digestion reagents, heat, or UV. Potassium dihydrogen phosphate and adenosine monophosphate (AMP) were used to assess analyzer performance for measuring orthophosphate and total phosphorus, respectively. The prototype analyzer produced a linear response during bench testing to total phosphorus with a precision of ±4.3% over a detection range concentration range of 30–200µg P/L. To evaluate the performance with natural waters, dilutions of algal culture with known phosphorus concentration were measured and found to be within 90% of nominal phosphorus concentrations. A preliminary cost analysis indicates that the operating components of the system (minus submersible housing) can be purchased for under $3000 compared to $30,000 for commercially available systems. At this low cost of construction, this sensor design may be a viable option for use in nutrient monitoring programs. Considering that system components have been designed to withstand internal pressures equivalent to a water depth of 100 m with a designed duty capacity of 2 weeks suggest the possibility of applications in coastal waters and relatively deep lakes.
Starting Page	1
Ending Page	4
File Size	713418
Page Count	4
File Format	PDF
ISBN	9780933957435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Phosphorus Standards Water Inductors Heating Microfluidics Underwater vehicles submersible phosphorus in-situ micro-fluidics
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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