A novel and selective spectral method for the determination of trace chlorine in water basing on the resonance scattering effect of rhodamine B-I(3) association nanoparticles.

In Na(2)HPO(4)-citric acid buffer solution, Cl(2) can oxidize I(-) to form I(2) and then it reacts with excess I(-) to form I(3)(-). The I(3)(-) combines respectively with rhodamine dyes, including rhodamine B (RhB), butyl rhodamine B (b-RhB), rhodamine 6G (RhG) and rhodamine S (RhS), to form association particles which give stronger resonance scattering (RS) effect at 400 nm. The RS intensity of the RhB, b-RhB, RhG and RhS systems is proportional to chlorine concentrations in the range of 0.

Determination of trace chlorine dioxide based on the plasmon resonance scattering of silver nanoparticles.

A plasmon resonance scattering (PRS) method for chlorine dioxide is reported based on the oxidization of silver nanoparticles (NPs) by it, in pH 9.1 ammonia-ammonium nitrate buffer solutions. Silver NPs exhibit strong PRS signals at 470nm, and can be oxidized by ClO(2), which results in PRS quenching at 470nm.

Oxidation of industrial dyeing wastewater by supercritical water oxidation in transpiring-wall reactor.

Industrial dyeing wastewater was oxidized in supercritical water in a transpiring-wall reactor, using hydrogen peroxide as an oxidant. Experiments were performed at 595 to 704 K and 18 to 30 MPa, with an oxidant dosage ratio ranging from 0.6 to 2.

Quantitative structure-activity relationship study on the biodegradation of acid dyestuffs.

Quantitative structure-biodegradability relationships (QSBRs) were established to develop predictive models and mechanistic explanations for acid dyestuffs as well as biological activities. With a total of four descriptors, molecular weight (M(W)), energies of the highest occupied molecular orbital (E(HOMO)), the lowest unoccupied molecular orbital (E(LUMO)), and the excited state (E(ES)), calculated using quantum chemical semi-empirical methodology, a series of models were analyzed between the dye biodegradability and each descriptor. Results showed that E(HOMO) and M(W) were the dominant parameters controlling the biodegradability of acid dyes.

Distribution characteristics and source analysis of dioxins in sediments and mussels from Qingdao coastal sea.

Seven of surface sediments, one sediment core and two mussel samples were collected from the Qingdao coastal sea of the western Yellow Sea and analyzed to determine the horizontal distribution, deposition flux, and toxicity equivalency (TEQs) of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The total PCDD/Fs concentrations in the surface sediments ranged between 10.7 and 428 ng kg(-1) dry wt.

[Running effects affected by sludge reducing by anaerobic hydrolysis-acidification and aerobic oxidation process of A1/A2/O bio-treatment system].

In the A1/A2/O bio-treatment system dealing with alkali minimization and dyeing-printing wastewater, residual sludge could be reduced effectively by recycling of sludge. The COD removal rate in A1 segment could be improved by residual sludge recycling to A1 segment. The COD elimination rate in A1 segment was raised from 15.

Control of bromate and THM precursors using ozonation combined system.

Objective: To investigate the feasibility of reducing THM precursors and controlling bromate taste and odor in drinking water taken from the Yellow River by an ozonation combined system.

Methods: The appropriate ozone dosage was determined, and then the changes of TOC, UV254 and THM formation potential (THMFP) in the combined system were evaluated.

Results: One mg/L ozone could effectively remove taste and odor and meet the maximum allowable bromate level in drinking water.

[A fluorescence quenching method for the determination of trace chlorite in water with rhodamine B].

In acidic sodium acetate-HCl buffer solution containing KI, Rhodamine B (RhB) has a fluorescence peak at 580 nm. When ClO2(-) exists fluorescence quenching occur. The fluorescence quenching intensity is linear with the concentration of ClO2(-) in the range of 0.

A novel, simple and sensitive resonance scattering spectral method for the determination of chlorite in water by means of rhodamine B.

A new resonance scattering method was proposed for the determination of chlorite, basing on the resonance scattering effect of rhodamine dye. In HCl-sodium acetate buffer solution, chlorite oxidizes I- into I2 and the reaction of I2 and excess I- results in I3- It is respectively combined with rhodamine dyes, including rhodamine B (RhB), butyl rhodamine B (b-RhB), rhodamine G (RhG) and rhodamine S (RhS), to form association complex particles, which exhibit stronger resonance scattering (RS) effect at 400 nm. The chlorite concentration of ClO2- in the range of 0.

Poly[[aqua-(1-naphthyl-acetato)cadmium(II)]-μ(3)-pyridin-3-olato].

In the title complex, [Cd(C(5)H(4)NO)(C(12)H(9)O(2))(H(2)O)](n), each Cd(II) atom is coordinated by two carboxylate O atoms from one 1-naphthyl-acetate ligand, two hydroxyl O atoms from two pyridin-3-olate ligands, one N atom from another pyridin-3-olate ligand and one water mol-ecule, and displays a distorted octa-hedral coordination geometry. The compound forms infinite chains of pyridin-3-olate ligands bridging 1-naphthyl-acetate-Cd(II) units parallel to the b axis, with a Cd⋯Cd separation of 3.578 (2) Å.

PCBs, PCNs and PBDEs in sediments and mussels from Qingdao coastal sea in the frame of current circulations and influence of sewage sludge.

Influence of current circulation and sewage sludge on spatial distributions of polychlorinated biphenyls (PCBs), polychlorinated naphthalenes (PCNs), and polybrominated diphenyl ethers (PBDEs) in sediments and mussels from the Qingdao coastal sea were investigated. Total concentrations of PCBs, PCNs and PBDEs in sediments ranged 6.5-32.

[A new fluorescence quenching method for the determination of trace ClO2 in water using silver nanoparticles].

In pH 9.1 NH4Cl-NH3 x H2O buffer solution, there is a fluorescence peak at 470 nm for silver nanoparticles. A fluorescence quenching takes place when it was oxidized by ClO2.

[Factors affecting residual sludge reducing by anaerobic hydrolysis-acidification and aerobic oxidation process of A1/A2/O bio-treatment system].

Hydrolysis-acidification and aerobic oxidation process could realize sludge reducing without those strengthening conditions such as high temperature, high pressure, strong oxidant or alkali which may destroy the cell structure of microorganisms, so it has good maneuverability and is economical. The purpose of sludge reducing system is mainly to degrade the pollutants in it ant its reducing effect is related to organic loading, HRT and temperature, etc. In the A1/A2/O bio-treatment system dealing with alkali minimization and dyeing-printing wastewater, residual sludge can be reduced effectively by recycling sludge to A1 segment.

[Studies on the performance of bioferric-SMBR].

To enhance removal efficiency and to mitigate membrane fouling, submerged membrane bioreactor and Bioferric process are combined to Bioferric-SMBR. Parallel compared experiment of Bioferric-SMBR and common SMBR dealing with dyeing wastewater was carried out. Bioferric-SMBR show great superiority and can enhance removal efficiency, reduce membrane fouling and improve sludge characteristic.

Decolorization and biodegradation of dye wastewaters by a facultative-aerobic process.

Background: Dye wastewater is one of the main pollution sources of water bodies in China. Conventional biological processes are relatively ineffective for color removal, the development of alternative treatment methods will become important. Our subjective was that of introducing a new biotreatment technology which combined a facultative biofilm reactor (FBR) with an aerobic reactor (AR) to treat a dye wastewater.

p16INK4A and p14ARF expression pattern by immunohistochemistry in human papillomavirus-related cervical neoplasia.

Human papillomavirus is known to play an important etiological role in the genesis of cervical cancer, but only a very small proportion of infected women develop invasive cervical cancer. The purpose of cervical cancer prevention is early diagnosis of its precursors. The molecular detection of human papillomavirus DNA as a diagnostic test to cervical carcinogenesis gave a low positive predictive value as compared to the use of biomarkers.

Predictive significance of the alterations of p16INK4A, p14ARF, p53, and proliferating cell nuclear antigen expression in the progression of cervical cancer.

Purpose: The purpose of this research was to evaluate the clinical significance of p16INK4A, p14ARF, p53, and proliferating cell nuclear antigen (PCNA) expression in tumor progression of cervical cancer.

Design: Seventeen patients (40 samples) with consecutive cervical lesions from normal squamous epithelium, inflammation of the cervix to cervical intraepithelial neoplasm (CIN) and invasive cervical squamous cell cancer (SCC), or from CIN to SCC were collected for this study. Expression of p16INK4A, p14ARF, p53, and PCNA were detected by immunohistochemistry on paraffin-embedded sections.