Stable Isotope Ratio Measurement of Dissolved Inorganic Carbon (DIC)
WS-CRDS provides simple δ13C measurements of DIC, enabling the source type of these compounds to be determined.
LI-COR LI-8100A Application Note
Capturing and processing soil GHG fluxes using the LI-8100A—Picarro
G4301 Eosense-Picarro Poster
A Portable Low Power Cavity Ring-Down Analyzer and Automated Soil Flux Chamber Measuring Wetland GHG Emissions
G4301 ICOS-LBNL-Picarro Poster
A Portable Low Power Cavity Ring-Down Analyzer and Automated Soil Flux Chamber Measuring Wetland GHG Emissions
Picarro Analyzer Loan/Lease Quick Guide
This guide helps users find manuals and product information and correctly start up and shut down their analyzer before shipping it back to Picarro.
ASTM, D8407-21, Standard Guide for Measurement Techniques for Formaldehyde in Air
https://www.astm.org/d8407-21.html
1. Scope1.1 This guide describes analytical methods for determining formaldehyde concentrations in air.
1.2 The guide is primarily focused on formaldehyde measurement technologies applicable to indoor (including in vehicle and workplace) air and associated environments (that is, chambers or bags, or both, used for formaldehyde emission testing). The described technologies may be applicable to other environments (ambient outdoor).
Calibration Guide for Picarro Analyzers
This document serves as a general guide on how to approach and successfully calibrate a Picarro cavity ring-down spectrometer (CRDS). The steps described herein can be used on isotopic and/or concentration analyzers that measure CO2, CO, CH4, H2O, C2H2, C2H4, C2H6, CH2O, O2 and N2O. Additional analyzers may require special or extra steps to calibrate properly.
S3110 Quick Start Guide for G4xxx Analyzers
This is the yearly maintenance kit quick start guide for Picarro's G4xxx analyzers.
S3092 Quick Start Guide for GHG, L2xxx, and EtO Analyzers
This is the yearly maintenance kit quick start guide for Picarro's GHG, L2xxx, and EtO analyzers.
S3094 Quick Start Guide for HAPs (Hazardous Air Pollutants) and G2xxx Analyzers
This is yearly maintenance kit quick start guide for Picarro's HAPs G2xxx analyzers.
A comparison of methods for the measurement of CO2 and CH4 emissions from surface water reservoirs: Results from an international workshop held at Three Gorges Dam, June 2012
Fluxes of carbon dioxide (CO2) and methane (CH4) from hydroelectric and water supply reservoirs are
receiving increasing attention around the world with a number of research groups having undertaken measurements
of these emissions across a range of lakes and reservoirs located in different climates and landscapes.
The use of floating chambers (aka flux chambers) is the most common technique for direct
measurement of these fluxes. However, the relative performance of different measurement systems, especially
Microwave extraction–isotope ratio infrared spectroscopy (ME-IRIS): a novel technique for rapid extraction and in-line analysis of δ18O and δ2H values of water in plants, soils and insects
Microwave extraction–isotope ratio infrared spectroscopy (ME-IRIS): a novel technique for rapid extraction and in-line analysis of δ18ORATIONALE
Traditionally, stable isotope analysis of plant and soil water has been a technically challenging, labour-intensive and time-consuming process. Here we describe a rapid single-step technique which combines Microwave Extraction with Isotope Ratio Infrared Spectroscopy (ME-IRIS).
METHODS
Carbon, nitrogen, and water stable isotopes in plant tissue and soils across a moisture gradient in Puerto Rico
Stable isotopes in the water molecule (2H or D and 18O), carbon, and nitrogen are useful tracers and integrators of processes in plant ecohydrological systems across scales. Over the last few years, there has been growing interest in regional to continental scale synthesis of stable isotope data with a view to elucidating biogeochemical and ecohydrological patterns. Published datasets from the humid tropics, however, are limited.
Expanding the scope and applicability of laser-based spectroscopy to studies of ecohydrology by removing organic contaminants in natural water
The ability to measure the stable isotopic composition of plant and soil waters, surface waters and ambient atmospheric vapor is essential to understanding an ecosystem's water budget, including how water cycles between the air, plants and the subsurface. With the advent of laser-based spectroscopy, e.g., Cavity Ring-Down Spectroscopy (CRDS), the isotopic analysis of waters has become increasingly cost-effective and prevalent, with comparable precision to conventional isotope ratio mass spectrometry methods.
The Journey of a Thousand Good Measurements Begins with One Replicate: Optimizing CRDS Measurements for Capturing Day-to-Day Variations in Triple Oxygen Isotopes of Rainfall
The demanding precision of triple oxygen isotope (17O) measurements in water has restricted its measurement to dual-inlet mass spectrometry until the recent development of commercially available infrared-laser analyzers, including cavity ringdown spectrometers (CRDS). 17O is now increasingly measured by laboratories in order to better constrain the source and history of meteoric waters.
Squandering water in drylands: the water-use strategy of the phreatophyte Ziziphus lotus in a groundwater-dependent ecosystem
Premise
Water is the most limiting factor in dryland ecosystems, and plants are adapted to cope with this constraint. Particularly vulnerable are phreatophytic plants from groundwater-dependent ecosystems (GDEs) in regions that have to face water regime alterations due to the impacts of climate and land-use changes.
Decomposition of litter mixtures induces non-additive effects on soil priming across a riparian land use gradient
While litter traits have been used for decades to predict decomposition rates through the Leaf Economics
Spectrum (LES) acquisitive to conservative trait lens, litter trait and litter mixture effects on soil carbon (C)
priming effects (PE) is less known. To assess whether the LES can predict soil C PE during the decomposition of
litter mixtures from complex ecosystems, a 99-day incubation experiment was conducted. The experiment
involved soil and leaf litter from three Canadian riparian land uses (grasslands, deciduous agroforests, and
Human Ammonia Emission Rates under Various Indoor Environmental Conditions
Ammonia (NH3) is typically present at higher concentrations in indoor air (∼10–70 ppb) than in outdoor air (∼50 ppt to 5 ppb). It is the dominant neutralizer of acidic species in indoor environments, strongly influencing the partitioning of gaseous acidic and basic species to aerosols, surface films, and bulk water. We have measured NH3 emissions from humans in an environmentally controlled chamber.
A simple method for rapid removal of the memory effect in cavity ring-down spectroscopy water isotope measurements
Rationale
The accuracy determined in the routine analysis of water isotopes (δ17O, δ18O, δ2H) using cavity ring-down spectroscopy is greatly affected by the memory effect (ME), a sample-to-sample carryover that biases measurements. This study aims to develop a simple method that rapidly removes the ME.
Reactive Chlorine Emissions from Cleaning and Reactive Nitrogen Chemistry in an Indoor Athletic Facility
Indoor gas-phase radical sources are poorly understood but expected to be much different from outdoors. Several potential radical sources were measured in a windowless, light-emitting diode (LED)-lit room in a college athletic facility over a 2 week period. Alternating measurements between the room air and the supply air of the heating, ventilation, and air-conditioning system allowed an assessment of sources. Use of a chlorine-based cleaner was a source of several photolabile reactive chlorine compounds, including ClNO2 and Cl2.
Isotopic measurements in water vapor, precipitation, and seawater during EUREC4A
In early 2020, an international team set out to investigate trade-wind cumulus clouds and their coupling to the large-scale circulation through the field campaign EUREC4A: ElUcidating the RolE of Clouds-Circulation Coupling in ClimAte. Focused on the western tropical Atlantic near Barbados, EUREC4A deployed a number of innovative observational strategies, including a large network of water isotopic measurements collectively known as EUREC4A-iso, to study the tropical shallow convective environment.
High time-resolution measurements of HCl in marine and continental urban areas: Implications for the reactive chlorine budget
Atmospheric oxidation is dominated by the OH radical, although Cl atoms can play an important role under certain conditions.
Understanding Sources of Atmospheric Hydrogen Chloride in Coastal Spring and Continental Winter
Ambient 0.5 Hz hydrogen chloride (HCl) measurements were made in Canadian cities to investigate chlorine activation and constrain the tropospheric chlorine budget. Springtime HCl mixing ratios in a coastal city (St. John’s, NL) were up to 1200 parts per trillion by volume (pptv) with a median of 63 pptv and were consistently elevated during daytime. High time-resolution measurements allowed the attribution of events to general sources, including direct emissions. Most coastal HCl was related to sea-salt aerosol acid displacement (R1) and chlorine activation.
Validation of a new cavity ring-down spectrometer for measuring tropospheric gaseous hydrogen chloride
Reliable, sensitive, and widely available hydrogen chloride (HCl) measurements are important for understanding oxidation in many regions of the troposphere. We configured a commercial HCl cavity ring-down spectrometer (CRDS) for sampling HCl in the ambient atmosphere and developed validation techniques to characterize the measurement uncertainties. The CRDS makes fast, sensitive, and robust measurements of HCl in a high-finesse optical cavity coupled to a laser centred at 5739 cm−1.
Development and Validation of a New In-Situ Technique to Measure Total Gaseous Chlorine in Ambient Air
Total gaseous chlorine (TClg) measurements can improve our understanding of unknown sources of Cl to the atmosphere. Existing techniques for measuring TClg have been limited to offline analysis of extracted filters and do not provide suitable temporal information on fast atmospheric process. We describe high time-resolution in-situ measurements of TClg by combusting ambient air over a heated platinum (Pt) substrate coupled to a cavity ring-down spectrometer (CRDS).