A total of 87 daily PM samples were collected in the urban area of Suzhou city during 2015, representing spring, summer, autumn, winter, respectively. Mass concentration of PM was analyzed gravimetrically. Water-soluble inorganic ions, including F, Cl, NO, SO, Na, NH, K, Mgand Ca, were determined by ion chromatography. The average mass concentration of PM was (74.26±38.01) μg·m. The seasonal variations of PM concentrations decreased in the order of winter > spring > autumn > summer. The average total mass concentrations of 9 ions was (43.95±23.60) μg·m, and the order of concentration of ions was NO > SO > NH > Na > Cl > K > Ca > F > Mg. Seasonal variation of ion concentrations was significant, with the highest concentration observed in winter and the lowest in summer. The secondary inorganic species, including SO, NO and NH (SNA) were the major components of the water-soluble ions in PM. SNA's correlations with each other were significant. SO, NO and NH were probably in the form of NHNO and (NH)SO. The [NO]/[SO] ratio approaching to 1 implied that mobile sources were as important as stationary sources. Ion balance calculations indicated strong correlations between anion and cation equivalents. The PM was acidic. Industrial emission, combustion process, secondary formation and fugitive dust were the major sources of the water-soluble ions in PM.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.13227/j.hjkx.201605094 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
ESIPT fluorescence turn-on sensors for detection of short chain inorganic polyphosphate in water.
Org Biomol Chem
December 2024
Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104 Freiburg im Breisgau, Germany.
We introduce two water-soluble excited state intramolecular proton transfer (ESIPT) based fluorescent turn-on probes responding to inorganic polyphosphates. These ESIPT probes enable specific detection of short-chain inorganic polyphosphates over a range of different condensed phosphates. The probes are weakly emissive in their off-state due to the blocking of ESIPT by Cu coordination.
View Article and Find Full Text PDFPivotal Role of the Intracellular Microenvironment in the High Photodynamic Activity of Cationic Phthalocyanines.
J Med Chem
December 2024
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr., 31, Building 4, Moscow 119071, Russia.
To investigate the influence of phthalocyanine aggregation on their photodynamic activity, a series of six cationic water-soluble zinc(II) phthalocyanines bearing from four to sixteen 4-((diethylmethylammonium)methyl)phenoxy substituents was synthesized. Depending on their structure, the phthalocyanines have different aggregation behaviors in phosphate buffer solutions ranging from fully assembled to monomeric states. Remarkably, independent of aggregation in buffer, very high photodynamic efficiencies against the tumor cell lines MCF-7 and MDA-MB-231 in the nanomolar range were found for all investigated phthalocyanine, and the IC(light) varied from 27 to 358 nM (3.
View Article and Find Full Text PDFSolubilization techniques used for poorly water-soluble drugs.
Acta Pharm Sin B
November 2024
Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200443, China.
About 40% of approved drugs and nearly 90% of drug candidates are poorly water-soluble drugs. Low solubility reduces the drugability. Effectively improving the solubility and bioavailability of poorly water-soluble drugs is a critical issue that needs to be urgently addressed in drug development and application.
View Article and Find Full Text PDFAmelioration of different acidic soils in China using seafood shell biochars.
J Environ Manage
December 2024
College of Resources and Environment, Anqing Normal University, Anqing, 246011, China.
Soil acidification limits crop and pasture production and leads to the degradation of agroecosystems. A substantial volume of seafood shells are discarded each year, which creates enormous environmental and social pressures. In this study, the anaerobic pyrolysis characteristics of four types of seafood shells (clam, scallop, oyster, and mussel) were evaluated.
View Article and Find Full Text PDFFlow field design and visualization for flow-through type aqueous organic redox flow batteries.
Proc Natl Acad Sci U S A
December 2024
Key Laboratory of Precision and Intelligent Chemistry, Department of Applied Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China.
Aqueous organic redox flow batteries (AORFBs), which exploit the reversible redox reactions of water-soluble organic electrolytes to store electricity, have emerged as a promising electrochemical energy storage technology. Organic electrolytes possess fast electron-transfer rates that are two or three orders of magnitude faster than those of their inorganic or organometallic counterparts; therefore, their performance at the electrode is limited by mass transport. Direct adoption of conventional cell stacks with flow fields designed for inorganic electrolytes may compromise AORFB performance owing to severe cell polarization.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!