№ lp_1_2_49266
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Checklist addressing laboratory practices, sample handling, calibration, and quality control requirements for nitrite nitrogen analysis under North Carolina certification and EPA Method 353.2.
Organization:
North Carolina Department of Environmental Quality, Division of Water Resources
Branch:
Wastewater/Groundwater Laboratory Certification Branch
Document type:
Laboratory quality assurance and compliance checklist
Analytical parameter:
Nitrogen, Nitrite
Analytical method:
EPA Method 353.2, Revision 2.0 (1993)
Analytical technique:
Automated continuous-flow analysis with cadmium reduction bypassed
Applicable regulations:
15A NCAC 2H .0805; 40 CFR 136
Equipment:
Automated continuous-flow analyzer; analytical balance
Reagents:
Color reagent; reagent water; wash solution; dilute hydrochloric acid; ammonium chloride-EDTA solution; nitrate and nitrite stock and standard solutions
Sample preservation and storage requirements:
Refrigeration ≤ 6 °C; analysis within 48 hours
Calibration requirements:
Multi-point calibration with blank; correlation coefficient ≥ 0.995
Quality control:
Second-source Quality Control Standard; ongoing calibration verification
Intended use:
Laboratory compliance review and certification assessment
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The product description is provided for reference. Actual content and formatting may differ slightly.
Year:
2017
Region / city:
Eastern Tropical North Pacific
Topic:
Nitrite concentration, oxygen minimum zone
Document Type:
Research article
Author:
Juliette Birkner
Target audience:
Scientific community, researchers in oceanography
Period of action:
2012–2017
Date of approval:
May 28, 2017
Date of changes:
N/A
Note:
Contextual description
Document Number:
DOC353.53.30574.Oct20
Product Name:
EZ1000 Series Nitrate Analyzer
Manufacturer:
Hach
Type of Document:
Technical Specification
Subject:
Semi-continuous online monitoring of nitrate and nitrite in water
Analytical Method:
Colorimetric measurement at 546 nm using NEDD
Applicable Standards:
ASTM 4500-NO3-A; ASTM 4500-NO2-A
Measurement Range:
0.2 to 10 mg/L NO3-N; optional 0.1 to 5 mg/L NO2-N
Limit of Detection:
≤0.2 mg/L NO3-N; ≤0.1 mg/L NO2-N
Cycle Time:
10 minutes per parameter
Protection Class:
IP55 (cabinet); IP65 (panel PC)
Certifications:
CE compliant; UL certified
Operating Temperature:
10 to 30 °C ±4 °C
Relative Humidity:
5 to 95 %, non-condensing
Power Supply:
As specified in installation drawings
Weight:
25 kg (55 lb)
Warranty Period:
Two years (Europe); one year (other geographies) from date of shipment
Maintenance Requirements:
Monthly reagent refill and validation/calibration; quarterly pump tubing replacement; annual calibration and tubing, valve and piston replacement
Installation Requirements:
Wall mounting per drawings; sample flow 100–300 mL/min; maximum particle size 100 µm; turbidity <50 NTU
Year:
2020
Region / City:
Qingdao, China
Topic:
Nitrogen and phosphorus removal, wastewater treatment
Document Type:
Research article
Author:
Barbosa, R.G., Sleutels, T., Verstraete, W., Boon, N.
Target Audience:
Environmental scientists, wastewater treatment professionals
Period of Action:
Not specified
Approval Date:
Not specified
Date of Changes:
Not specified
Year:
No data available
Region / City:
Mumbai, Maharashtra, India
Subject:
Chemical Safety
Document Type:
Safety Data Sheet
Organization / Institution:
OXFORD LAB FINE CHEM LLP
Author:
No data available
Target Audience:
Industry professionals, researchers
Period of validity:
No data available
Approval Date:
No data available
Amendment Date:
No data available
Description:
Safety data sheet for Dicyclohexylamine Nitrite, including hazard classification, first aid measures, handling and storage precautions, and exposure controls.
Year:
2026
Region / City:
Falmouth, Massachusetts, USA
Subject:
Environmental Regulation, Water Quality, Nitrogen Pollution
Document Type:
Municipal Health Regulation
Authority / Agency:
Falmouth Board of Health, Massachusetts Department of Environmental Protection
Target Audience:
Property owners, builders, developers
Legal Reference:
M.G.L. c. 111 § 31; 310 CMR 15.003(3); 314 CMR 21.00; Massachusetts Clean Waters Act M.G.L. c. 21 §§ 26-53; 314 CMR 4.00
Scope:
Nitrogen Regulated Areas including public/private water supply protection and nitrogen-impaired watersheds
Effective Measures:
Requirement for Best Available Nitrogen Reducing Technology in new construction
Exemptions:
Future sewer service areas under approved town funding
Year:
2022
Region / City:
North Carolina
Topic:
Analytical Methodology
Document Type:
Standard Operating Procedure
Organization / Institution:
Hach Company
Author:
N/A
Target Audience:
Laboratory Technicians
Period of Effectiveness:
N/A
Approval Date:
N/A
Modification Date:
N/A
Context:
A Standard Operating Procedure for performing Total Kjeldahl Nitrogen (TKN) analysis using the Hach TNTplus 880 Method 10242.
Year:
2026
Region / City:
Falmouth
Topic:
Environmental Regulation, Wastewater Management
Document Type:
Regulation
Agency:
Town of Falmouth, Massachusetts Department of Environmental Protection
Author:
Town of Falmouth
Target Audience:
Property owners, builders, and environmental professionals
Effective Period:
Ongoing
Approval Date:
Not specified
Amendment Date:
Not specified
Jurisdiction:
Massachusetts, United States
Issuing authority:
Massachusetts Department of Environmental Protection
Program name:
Natural Resource Nitrogen Sensitive Area Grant Program
Fiscal year:
FY26
Funding purpose:
Planning activities related to Watershed Management Plans and watershed permit applications addressing nitrogen pollution
Eligible applicants:
Local Government Units in designated Natural Resource Nitrogen Sensitive Areas
Geographic scope:
Cape Cod watersheds designated as NRNSA
Funding source:
Capital Fund
Total funding available:
Up to $830,000
Grant amount range:
$20,000–$350,000 per award
Eligible activities:
Watershed planning, nitrogen load assessment, modeling, and related analyses
Ineligible activities:
Construction, implementation, operation, or maintenance projects
Application period:
State Fiscal Year 2026
Eligible work period:
July 1, 2025 – June 30, 2026
Regulatory references:
314 CMR 21.00; 310 CMR 15.000; Clean Water Act §208
Year:
1995–2026
Region:
Maine, United States
Subject:
Air pollution control, nitrogen oxides emissions
Document type:
Regulation / Legal Chapter
Issuing authority:
Maine Department of Environmental Protection
Affected facilities:
Stationary sources with potential NOx emissions ≥100 tons/year
Exemptions:
Units emitting <10 tons/year, emergency stationary engines
Compliance methods:
Continuous emission monitoring systems (CEMS)
Key definitions:
1995 Moderate Nonattainment Area, 2022 Ozone Transport Region, affected unit, large boiler, large turbine, Kraft recovery boiler, lime kiln
Effective date:
May 1, 2026
Supersedes:
Prior RACT requirements in sections 3 and 6
Year:
1993
Region / City:
North Carolina
Topic:
Laboratory Certification, Ammonia Nitrogen Analysis
Document Type:
Standard Operating Procedure
Organization / Institution:
NC DEQ/DWR Laboratory Certification Branch
Author:
Not specified
Target Audience:
Laboratories conducting ammonia nitrogen analysis
Period of Validity:
Not specified
Approval Date:
Not specified
Date of Changes:
Not specified
Year:
2017
Region / city:
Ozone Transport Region (OTR), Cross-State Air Pollution Rule Update (CSAPR U) states
Subject:
Nitrogen Oxides (NOx) emissions control measures
Document type:
White Paper
Organization / Institution:
Ozone Transport Commission (OTC)
Author:
Ozone Transport Commission (OTC)
Target audience:
State and federal policymakers, environmental regulators
Period of validity:
2018 and beyond
Approval date:
2017-08-28
Date of changes:
Not specified
Note:
Year
Subject:
Laboratory Certification, Water Quality Testing
Document Type:
Certification Checklist
Organization / Institution:
NC DEQ/DWR Laboratory Certification Branch
Target Audience:
Laboratory personnel and analysts
Year:
2020
Region / city:
United States
Subject:
Environmental monitoring, air quality analysis
Document Type:
Standard Operating Procedure
Organization / institution:
Environmental Protection Agency (EPA)
Author:
Environmental Protection Agency (EPA)
Target Audience:
Instrument operators, environmental monitoring professionals
Effective Date:
July 2020
Date of Approval:
July 2020
Method:
Chemiluminescent absorbance, photolytic conversion, CAPS spectroscopy
Measurement Range:
0 - 200 ppb
Detection Limit:
< 0.040 ppb
Temperature Range:
5 to 40°C
Sampling Method:
Continuous monitoring, real-time measurement
Instrumentation:
Teledyne API T500U, Teledyne API T200UP
Calibration Method:
Zero air and span NO2 concentration
Sampling Period:
June 1 to August 31 annually
Disclaimer:
No official EPA endorsement implied
Year:
2018
Region / City:
United States
Topic:
Medical Gas Systems, Nitrogen Purging, Brazing
Document Type:
Technical Guide
Organization:
NFPA
Author:
Not specified
Target Audience:
Installers, Contractors, Technicians
Period of Validity:
Not specified
Approval Date:
Not specified
Date of Amendments:
Not specified
Document type:
Supplementary materials
Related article title:
Nitrogen Transformation Promotes the Anaerobic Degradation of PAHs in the Water Level Fluctuation Zone of the Three Gorges Reservoir in Yangtze River, China
Authors:
Shupei Yuan; Xinkuan Han; Xiangyang Yin; Peixing Su; Yiying Zhang; Yinfei Liu; Juntong Zhang; Daijun Zhang
Corresponding author:
Daijun Zhang
Affiliation:
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University
Note:
Affiliation
Department of Environmental Science, College of Environment and Ecology, Chongqing University
Country:
People’s Republic of China
Study area:
Water Level Fluctuation Zone of the Three Gorges Reservoir, Yangtze River, China
Pages:
9
Number of tables:
6
Number of figures:
4
Methods included:
Assays for concentration of PAHs; high-performance liquid chromatography (HPLC) analysis; high-throughput sequencing; functional gene quantification; co-occurrence network analysis
Analyzed parameters:
Soil physicochemical characteristics; PAH concentrations; functional genes; microbial diversity indices; KEGG pathways; bacterial network topology
Experimental approach:
In-situ experiment
Year:
2025
Region / City:
Tirupati
Topic:
Agricultural science, Agronomy, Fodder crops
Document type:
Research article
Organization / Institution:
S.V. Agricultural College, ANGRAU
Author:
A.P. Jagadeesh, S. Tirumala Reddy, V. Chandrika, A.R. Nirmal Kumar
Target audience:
Researchers, Agricultural professionals, Academics
Period of validity:
2023 Kharif season
Date of approval:
25-05-2025
Date of receipt:
21-05-2025
Date of changes:
Not specified
Document Type:
Session Proposal
Session Title:
Plant nitrogen utilization: from cell to field
Format:
Oral presentations
Organizers:
Weiming Shi; Yufang Lu; Toru Fujiwara; Herbert J. Kronzucker; Eiko Kuramae
Primary Contact Persons:
Weiming Shi; Yufang Lu
Affiliated Institutions:
Institute of Soil Science, Chinese Academy of Sciences; The University of Tokyo; The University of Melbourne; Netherlands Institute of Ecology
Proposed Speakers:
Toru Fujiwara; Herbert J. Kronzucker; Eiko Kuramae; Caixian Tang; Zhenhua Zhang; Wei Xuan; Chao Ai; Zhi Quan
Thematic Focus:
Plant nitrogen utilization; nitrogen sensing and transport; root-soil-microbe interactions; soil nitrogen transformation; nitrogen management in agricultural systems
Target Audience:
Plant nutrition scientists; soil scientists; early-career researchers; international researchers
Scope:
From cellular mechanisms to field-level agricultural systems
Year:
2023
Region / City:
Wuxi, Shanghai, Nanjing, London, Leuven, Cambridge, Mainz
Subject:
Nitrogen Fixation, Electrochemical Catalysis
Document Type:
Research Article
Organization / Institution:
Jiangnan University, Donghua University, Nanjing University of Posts & Telecommunications, University College London, KU Leuven, University of Cambridge, Max Planck Institute for Polymer Research
Author:
Wei Zong, Haiqi Gao, Yue Ouyang, Kaibin Chu, Hele Guo, Leiqian Zhang, Wei Zhang, Ruwei Chen, Yuhang Dai, Fei Guo, Jiexin Zhu, Zhenfang Zhang, Chumei Ye, Yue-E Miao, Johan Hofkens, Feili Lai, Tianxi Liu
Target Audience:
Researchers in material science, chemistry, and catalysis
Period of Validity:
N/A
Approval Date:
N/A
Date of Changes:
N/A
Year:
2013
Region / City:
Princeton, NJ
Field:
Environmental Science, Sustainable Development
Document Type:
Curriculum Vitae
Institution:
Princeton University
Author:
Xin Zhang
Target Audience:
Academic, Research Institutions, Policy Makers
Period of Activity:
2005-present
Date of Approval:
Not specified
Date of Changes:
Not specified