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It has the high separation characteristic of gas chromatography and has the characteristics of mass spectrometry which can identify the compound structure accurately, and it can achieve the purpose of the qualitative and quantitative detection at the same time.
Except for a few degrading bacteria such as Ralstonia spp H850, such as Pseudomonas LB400 can degrade PCBs below7 Cl, the majority of bacteria can degrade PCBs in less than 4 Cl.[17] Anaerobic reduction catalytic reduction process is the removal of chlorine, that is, the higher chlorinated homologues become lower chlorinated homologues from high chlorine-substituted homologues through, but can not destroy the structure of the benzene ring, the degradation rate and degree of chlorination, replace the position that has a direct relationship.
Environmental chemistry,2006,25( 3) : 340 －343
The fifth national conference on environmental chemistry ( 2009)

All of these methods require the preconcentration procedure [22-24] including the use of structured polymers [25-27].
The structure of TPP improves sorption of the organic compound into the body of the matrix and helps increase sensitivity of this analytical method [32, 33].
Proskurnin, Potentials of thermal lens spectroscopy for polymethacrylate optical sensors, Journal of Analytical Chemistry 66(6) (2011) 623-628
Mokrousov, A sensitive optical element for mercury(II), Journal of Analytical Chemistry 62(9) (2007) 832-836

Their sponge-like structure makes the complete drying difficult to achieve and residual water (before 100°C) can overlap with bound water.
Due to their amorphous state or badly crystallized structure, XRD is not very effective to reveal the presence of C─S─H.
Lea’s Chemistry of Cement and Concrete (5th Edition), 363-467
Symposium in the Chemistry of Cements

Microscopic and Biochemical characterization of stress-tolerant bacterial isolates Colony characterization of stress-tolerant bacterial isolates was done by growing them on nutrient agar plates at a temperature of 37ºC for 48 hours and the structure of the cell was analyzed by light microscope and by gram stain.
As Ag nanoparticles have greatly acquired an interest in several applications of new technologies such as in chemistry, electronics, biology, food, agriculture, medicine, biotechnology, etc.
Zhang, Oxygen vacancy associated surface fenton chemistry: surface structure dependent hydroxyl radicals generation and substrate dependent reactivity, Environ Sci.

One of the effective and safe solutions for the neutralization of technogenic soils from heavy metal ions is associated with their conversion into difficult-to-dissolve substances, which are close in chemical composition and structure to safe natural minerals [6-11].
Ju, Electrochemical sensing of heavy metal ions with inorganic, organic and bio-materials State Key Laboratory of Analytical Chemistry for Life Science, Department of Chemistry, Nanjing University, Nanjing 210093
Petriaev, The Modern Structure for Storm Sewage Purification of Roads, Procedia Engineering. 189 (2017) 576–581.

Long-term operation (38-52 years) led to the loss of waterproofing properties of the landfill structures, and, as a result, the ingress of harmful substances into unprotected aquifers and the contamination of local water supply sources.
The precipitates formed by urea have particles of a plate shape, which are combined into flower-like structures.
Harvey, Modern analytical chemistry.
D, “Green chemistry concept: Applications of catalysis in pharmacuetical industry,” Glob.

Many things concerning asphalt structure are still unknown.
The elucidation of the molecular structure of NA is becoming more and more important because the conventional petroleum resources are becoming increasingly short, heavy crudes are becoming an important energy source in the 21st century due to their considerable reserves.
Hence, a great care should be taken to research on NA chemistry and organic geochemistry in the future work.
These detected organic compounds were classified into four group components: HACs, 2-MAs, PAEs and others. 2-MAs are a class of important biomarkers for the research on crude oil chemistry and organic geochemistry.

The kinetics of penetration correlates mainly to the geometric structure of the powder packing and the wettability of the particles.
Grundke, in: Handbook of Applied Surface and Colloid Chemistry edited by K.

Simultaneous Reduction and Immobilization of Cr2O72- in Metakaolinite-based Geopolymer Complexed Reductant Jieyu Chen1, 2,a *, Xinrong Lei1,2, Sun Tao1 1 Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China 2 Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, PR China a chenjieyu@cug.edu.cn Keywords: geopolymer; chromium; Geopolymerization; immobilization Abstract: Reduction and immobilization of Cr(VI) as Cr2O72- is investigated by using metakaolinite-based geopolymer complexed reductant.
By comparison with the immobilization of Cr (III), the added reductants reduced Cr (VI) to Cr (III) which can be locked successfully in the amorphous structure of geopolymer.
In comparison, geopolymer with amorphous network structure, mainly constructed by aluminosilicates, hosts much better acidic resistivity, durability in nature, low permeability and high compressive strength compared with cement [16, 17].
Using this method, reduction and immobilization of chromium can be realized by one-step procedure of geopolymerization, in which reduced Cr3+ is locked in the amorphous structure of geopolymer instead of being re-oxidized.
Cr added as Cr3+ can be locked successfully in the amorphous structure in geopolymer and leached Cr concentration is lower 5 mg L-1 when initial Cr(Ⅲ) concentration is less than 1 wt.%.

Synthesis N-Phenyl Pyrazoline from Dibenzalacetone and Heme Polymeration Inhibitory Activity (HPIA) Assay Linda Ekawatia, Bambang Purwonob* and Muhammad Idham Darussalam Mardjanc Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Jl.
The structure of products was characterized by FT-IR, GC-MS, DI-MS, 1H- and 13C-NMR The result of heme polymerization inhibitory activity assay showed that IC50 of B1 and B2 1.26 and 0.79 mM while quinine 1.26 mM.
General structure of dibenzalacetone.
The purity and structures of all synthesized compounds were confirmed by TLC and spectroscopic techniques, respectively.
Li, Structure-activity relationship studies of curcumin analogues, Bioorg.