Hardening property of cement mortar adding heavy metal compound and solubility of heavy metal from hardened mortar

The contamination of important synthetic (surface unmodified) polymers by various heavy metal compounds (such as copper, manganese and lead) in aqueous medium was investigated in this study. The influence of the pH of the aqueous medium, temperature and metal type on contamination was investigated during a 10 day period. It was found that increasing pH contributed to higher polymer contamination (at higher pH 100 times for copper and up to 400 times for lead), as well as contact with easily penetrable substances. Increasing temperature decreased contamination by the metal compound for PELD and PET which was not the case for PEHD and PR.

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POTENSI KITOSAN DARI LIMBAH CANGKANG UDANG Penaeus monodon ASAL BINTUNI SEBAGAI BIOSORBEN LIMBAH ORGANIK DAN LOGAM BERAT PADA LIMBAH CAIR PLTD MANOKWARI

Jurnal Natural ◽

10.30862/jn.v17i1.142 ◽

2021 ◽

Vol 17 (1) ◽

pp. 18-25

Author(s):

Lancyfolia Rumaropen ◽

Bertha Mangallo ◽

Muhammad Fajar Islam

Keyword(s):

Heavy Metal ◽

Organic Compound ◽

Organic Carbon ◽

Total Organic Carbon ◽

Penaeus Monodon ◽

Fuel Oil ◽

Adsorption Study ◽

Zinc Metal ◽

Shrimp Shells ◽

Heavy Metal Compound

The purpose of this research is to study the potency of chitosan synthesis of shrimp shells from Bintuni as a biosorbent of organic compound and heavy metal compound. The main procedure of chitosan synthesis is completed by insulating chitin from shrimp shells and then chitin is deacetilated to transform chitin to be chitosan. The wastewater were characterized to know the concentration of Total Organic Carbon (TOC), fat oil, and Zinc metal and studied the adsorption of each compound at 0,1; 0,5; 1; 2g dosage chitosan. Adsorption study result showed that chitosan can adsorb the fuel oil and Zinc metal which contained in wastewater. However, it was not adsorb the TOC compound. The yield of chitosan is 46,88%. Increasing the chitosan by up to 2 g resulted in the creasing of the adsorption effectiveness up to 99,09% for the fuel oil and 69,28% for Zinc. The maximum chitosan adsorption capacity accomplished at 0,1gram chitosan in 100 mL wastewater.

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Studies on potential of Portland cement mortar for binding of waterworks sludge to reduce heavy metal leaching

Sadhana ◽

10.1007/s12046-016-0472-0 ◽

2016 ◽

Vol 41 (3) ◽

pp. 359-367 ◽

Cited By ~ 2

Author(s):

Paramalinggam Thanalechumi ◽

Abdull Rahim Mohd Yusoff ◽

Mohanadoss Ponraj ◽

Hanim Awab

Keyword(s):

Heavy Metal ◽

Portland Cement ◽

Cement Mortar ◽

Metal Leaching ◽

Heavy Metal Leaching ◽

Waterworks Sludge

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A Rapid Simple Long-Term Toxicity Assay for Aquatic Contaminants Using the Nematode Panagrellus redivivus

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f80-149 ◽

1980 ◽

Vol 37 (7) ◽

pp. 1167-1174 ◽

Cited By ~ 41

Author(s):

M. R. Samoiloff ◽

S. Schulz ◽

Y. Jordan ◽

K. Denich ◽

E. Arnott

Keyword(s):

Heavy Metal ◽

Toxicity Assay ◽

Free Living ◽

Metal Compounds ◽

Panagrellus Redivivus ◽

Free Living Nematode ◽

Mutagenic Effects ◽

Aquatic Contaminants ◽

Heavy Metal Compound

Two protocols using the free-living nematode Panagrellus redivivus to determine the developmental or mutagenic effects of environmental contaminants were tested. Fifteen known carcinogens or mutagens, six suspected carcinogens, and seven heavy metal compounds were tested at concentrations ranging from 10−8 to 10−3 mol/L. A developmental assay using frequency of completion of the three postembryonic molts detected toxic effects of 24 of the 28 tested agents, while survival was decreased in only 10 of the 28 agents. Mutagenesis was detected in 12 of the known carcinogens, three of the suspected carcinogens, and one heavy metal compound. Therefore, assays are suitable for detection of long-term toxicity of contaminants in aquatic environments.Key words: Panagrellus, nematode, carcinogens, mutagens, developmental assay, toxicology assay

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Complementary Z-Contrast Imaging and Digital Image Processing

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118394 ◽

1985 ◽

Vol 43 ◽

pp. 304-305

Author(s):

K. N. Colonna ◽

G. Oliphant

Keyword(s):

Image Processing ◽

Heavy Metal ◽

Digital Image Processing ◽

Digital Image ◽

Biological Tissue ◽

Biological Imaging ◽

Tissue Preparation ◽

Contrast Imaging ◽

Imaging Tool ◽

Z Contrast

Harmonious use of Z-contrast imaging and digital image processing as an analytical imaging tool was developed and demonstrated in studying the elemental constitution of human and maturing rabbit spermatozoa. Due to its analog origin (Fig. 1), the Z-contrast image offers information unique to the science of biological imaging. Despite the information and distinct advantages it offers, the potential of Z-contrast imaging is extremely limited without the application of techniques of digital image processing. For the first time in biological imaging, this study demonstrates the tremendous potential involved in the complementary use of Z-contrast imaging and digital image processing.Imaging in the Z-contrast mode is powerful for three distinct reasons, the first of which involves tissue preparation. It affords biologists the opportunity to visualize biological tissue without the use of heavy metal fixatives and stains. For years biologists have used heavy metal components to compensate for the limited electron scattering properties of biological tissue.

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Recent Progress In High-Resolution Shadowing For Biological Transmission Electron Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100181300 ◽

1990 ◽

Vol 48 (1) ◽

pp. 510-511 ◽

Cited By ~ 1

Author(s):

Heinz Gross ◽

Katarina Krusche ◽

Peter Tittmann

Keyword(s):

Heavy Metal ◽

High Resolution ◽

Freeze Drying ◽

Atmospheric Conditions ◽

Vacuum Equipment ◽

Transmission Electron ◽

Gas Atmosphere ◽

Gas Molecules ◽

Residual Gas ◽

Backing Layer

Freeze-drying followed by heavy metal shadowing is a long established and straight forward approach to routinely study the structure of dehydrated macromolecules. Very thin specimens such as isolated membranes or single macromolecules are directly adsorbed on C-coated grids. After rapid freezing the grids are transferred into a suitable vacuum equipment for freeze-drying and heavy metal shadowing.To improve the resolution power of shadowing films we introduced shadowing at very low specimen temperature (−250°C). To routinely do that without the danger of contamination we developed in collaboration with Balzers an UHV (p≤10-9 mbar) machine (BAF500K, Fig.2). It should be mentioned here that at −250°C the specimen surface acts as effective cryopump for practically all impinging residual gas molecules from the residual gas atmosphere.Common high resolution shadowing films (Pt/C, Ta/W) have to be protected from alterations due to air contact by a relatively thick C-backing layer, when transferred via atmospheric conditions into the TEM. Such an additional C-coat contributes disturbingly to the contrast at high resolution.

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