Davidson, Christine M. and Mertz-Kraus, Regina (2018) Atomic

Overview

This source page is a mechanical bulk-ingest record for a PDF in the research-pulls corpus. It preserves source-level identity, routeable product/analyte scope, and exact extracted numeric lines for later human or fresh-context audit. It does not derive HMTc thresholds, percentiles, or brand-by-brand comparisons.

Key numbers

The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:

TedlarTM gas bags performed well as samplers, although 60 to 90% losses of methylated species
available as NIST SRM 2786 (fine atmospheric particulate matter (mean particle diameter <10
µm) and NIST SRM 2787 (fine atmospheric particulate matter (mean particle diameter
uncertainities of <1.5% and <0.2‰ for H and C. Aliquots of these reference gases were
Nd, Pr, Sc, Sm, Tb, Tm, Y and Yb were >95% when NIST SRM 1633b (coal fly ash) was
258.056 nm and results obtained on a range of CRMs were within their certified uncertainity
A portable system37 for the on-line determination of Hg speciation in flue and process
ratios and elemental ratio in magnetite and SiO2 particles in the size range 50-140 nm. In a
Reno. At a temporal resolution of ca. 5 minutes, their Hg0 measurements were within 10-25%
spectrometry (SES) at the characteristic C line of 247.856 nm. The absolute LOD was 1.6 ng,
quantitative, within stated certified ranges, when test portions of IRMM CRM BCR 723 (road
matrix air was replaced with Ar sufficient to sustain the plasma. The method LOD of 0.12 ng
highly enriched in Hg and displayed wide ranges of both 202
(up to 10% v/v) in gases produced by the pyrolysis of sulfur-rich kerogen were minimised The
distribution could now be interrogated so as a result 89% of the non-refractory chemical mass
of PM2.5 was detected. This was an improvement over the previous design in which only 65%
such as fuzzy c-means clustering, are invaluable. A new approach62 applied OPTICS (ordered
probe66 was capable of measuring accurately species-specific, stable N-isotope ratios in bulk
correlation (R2 >0.95) although slope values ranged between 0.97 and 1.8 (average 1.28). The
carbon substrate. A bias in U mass measurements of up to 15% was attributed to beam
mean errors and the standard errors of identified main phases as low as ca. 1%.
sulfate to form a highly sensitive fluorophore. Method LODs of <0.01 ng L-1, equating to <0.1
reflectance) protocols. About 80% of this discrepancy was attributable to a difference in the
peak inert mode temperature employed and the remaining ca. 20% to a difference in the optical
respirable-size crystalline silica collected on an air filter sample. The LOD of ca. 0.2 µg for
certified values to be assigned. Mercury was stable at a concentration of 0.4 µg kg-1 in the
summarised in Tables 1, 2 and 3. It should be noted that the last entry in Table 199 is for a
Table 1 Preconcentration methods using solid phase extraction for the analysis of waters
Table 2 Preconcentration methods using liquid phase extraction for the analysis of water
Table 3 Preconcentration methods using combined solid and liquid phase extraction for the analysis of water
conditions and with ICP-MS detection, the LODs were in the range 0.82 (MMA) to 1.2 (AsIII)
ng L-1 and the precision (RSD) 3.2 (MMA) to 5.6% (DMA) (n=10). The method was tested
sample with a recovery >80%. The NPs were separated magnetically from the sample and the
analytes extracted with 4 mL of a solution containing 1% m/v thiourea and 5% v/v HCl prior to
detection by HG-AFS. The LOD was 0.002 µg L-1 as As and the precision for each species was
1.95% RSD for AsIII and 2.55% RSD for AsV (n=6). Mixed micelle DLLME123 was used to
adjusted to pH 2 and CrVI extracted with 1 mL of a 10% m/v solution of the cationic surfactant
upper layer was removed and dissolved in 0.2 mL of methanol containing 2% v/v HNO3. The
Both extracts were analysed directly by ETAAS. The LODs were 0.5 pg mL-1 for CrIII, 0.6 pg
mL-1 for CrVI and 0.7 pg mL-1 for total Cr with a maximum RSD of 6% for 10 replicates within
the linear range of 0.02 to 1 ng mL-1. The method was validated against the IRMM CRMs BCR
hydroxide and 4% v/v methanol at pH 4. The cartridge was dried by passing air through then

Methods (brief)

of environmental samples. This Update refers to papers published approximately between
of new air samplers using 3D printer technology, development of a portable aerosol
The advent of ICP-MS/MS systems has enabled analysts to develop improved methods for the
analysts to forego the use of many onerous sample clean-up procedures. Improvements in the
based upon FFF and sp-ICP-MS techniques to measure such inputs. Similar concerns exist for
involve the use of sample preconcentration using chelating columns and ICP-MS analysis have
has been increased interest in the measurement of NPs. Many comparisons of sample digestion
optimal in a different laboratory using different apparatus. New sample preconcentration
validation often failed to reflect the nature of the intended sample(s). A noteworthy advance is
technique. Much work continues on ways of improving isotope ratio measurements by ICP-
High spatial resolution analysis by LIBS, LA-ICP-MS and SIMS to obtain data on chemical
1.4 Sample preparation
1.5.1 Atomic absorption, emission and fluorescence spectrometry
1.5.2 Mass spectrometry
1.5.2.1 Inductively coupled plasma mass spectrometry
1.5.2.2 Other mass spectrometry techniques
2.3 Sample preconcentration and extraction
2.5.1 Atomic absorption spectrometry

Implications

This page makes the source discoverable for category-level evidence routing. Values remain source-native and should be used only with the stated matrix, species, basis, geography, and censoring context from the paper. The page does not convert total mercury to methylmercury or use total arsenic as inorganic arsenic.

Wiki pages this source may touch

Verification notes

Identity check: DOI, raw handle, candidate cite-key, and SHA-256 were compared against existing wiki/sources/ pages before creation.
Full-PDF read: pdftotext -layout was run on the full PDF twice; extracted text hashes matched before the page was written.
Numeric verification: numeric/table-bearing lines were selected mechanically from the verified extraction and preserved without unit conversion or rounding.
Brand firewall: the worker skips PDFs when extracted numeric lines appear brand/manufacturer-sensitive; this page contains category-level or species-level evidence only.
HMTc firewall: no threshold, percentile, pass/fail, clean/dirty, or certification math is stated.

Update history

The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.

Commit	Date	Change	Description
b01ec52c	2026-08-04	major	2 sections added
d49e450f	2026-08-03	major	5 sections added; narrative text revised