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Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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COD Low Range Reagent Vials EPA Method (25 tests ...
COD Low Range Reagent Vials EPA Method (25 tests ...

The HI93754A-25 are barcode reagent vials that follow the EPA approved method for the low range ,determination of chemical oxygen demand, (,COD,) using a compatible benchtop photometer. These high quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each box for traceability. Pre-dosed reagents for ease of use Supplied ...

COD determination: Removing Cl Interference in StSeawaters
COD determination: Removing Cl Interference in StSeawaters

A) ,Interference, elimination Chloride-OLD PROCEDURE ISO 15705: 2002 ,Determination, of the ,chemical oxygen demand, index (ST‐,COD,) – small‐scalesealed‐tubemethod ISO small sealed‐tube method. The most frequent procedure to remove Cl‐with a maximum weight ratio 10:1, HgSO 4 + 2 2Cl‐→ HgCl 2 + SO 4 ‐(3) scale 2

The CHEMetrics COD System
The CHEMetrics COD System

Chemical Oxygen Demand, (,COD,) Methods The ,determination of Chemical Oxygen Demand, (,COD,) is widely used in munic-ipal and industrial laboratories to measure the overall level of organic contamination in ,wastewater,. The con-tamination level is determined by measuring the equiv-alent amount of oxygen required to oxidize organic matter in the sample.

Chemical Oxygen Demand - hannasingapore.com
Chemical Oxygen Demand - hannasingapore.com

COD, test uses a strong oxidant, potassium dichromate (k 2 Cr 2 O 7), to fully oxidize the organic molecules in a sample into carbon dioxide (CO 2) and water.Dichromate readily gives up oxygen (O 2) to bond with carbon atoms to create carbon dioxide.In the process the potassium dichromate is reduced from the hexavalent (C +6) state in the dichromate to the trivalent (Cr +3) state.

Rapid Determination of the Chemical Oxygen Demand of Water ...
Rapid Determination of the Chemical Oxygen Demand of Water ...

system for the ,determination of the chemical oxygen demand, (,COD,) of water samples. Glucose solutions of different concentrations and actual water samples were tested, and their ,COD, values were determined by measuring the heat generated when the samples passed through a column containing periodic ,acid,.

COD determination: Removing Cl Interference in StSeawaters
COD determination: Removing Cl Interference in StSeawaters

A) ,Interference, elimination Chloride-OLD PROCEDURE ISO 15705: 2002 ,Determination, of the ,chemical oxygen demand, index (ST‐,COD,) – small‐scalesealed‐tubemethod ISO small sealed‐tube method. The most frequent procedure to remove Cl‐with a maximum …

Exp 1 Chemical Oxygen Demand - Civil Engineers PK
Exp 1 Chemical Oxygen Demand - Civil Engineers PK

Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as ammonia and nitrite. COD measurements are commonly made on samples of waste waters or of natural waters contaminated by domestic or industrial wastes.

Wastewater treatment in the fishery industry - 2 ...
Wastewater treatment in the fishery industry - 2 ...

A common ,interference, factor in the ,COD, test is the presence of chlorides. If seawater is used at some point in the processing or salt brines are used for some "curing" operations, chlorides will most probably appear in the ,wastewater, causing ,interference, while they are oxidized by the dichromate: Cl-+ Cr 2 O 7 2-+ 14H + 3 Cl 2 + 2Cr 3+ + 7H 2 O

Determination of the chemical oxygen demand (COD) in water ...
Determination of the chemical oxygen demand (COD) in water ...

COD, is widely used in the analysis of natural water, to control ,wastewater, treatment from organic various substances. Lumex Instruments provides the method and equipment (FLUORAT-02 analyzer and TERMION thermoreactor) for accurate, easy-to-use and cost-effective ,COD determination, using the small-scale sealed tube method (ST-,COD,).

Matrix interference reduction for the analysis of ...
Matrix interference reduction for the analysis of ...

At present, the major method for SMP fractions ,determination, is still the photometric analysis methods, which were modified by B. Frølund in 1996 (Frølund et al. 1996).The corrected Lowry method is usually employed to account for the influence of humic substances in the ,determination, of protein, and the total carbohydrate content is often determined using the anthrone-sulfuric ,acid, method or ...

Wastewater COD - How to Use Chemical Reactions to ...
Wastewater COD - How to Use Chemical Reactions to ...

In a solution with a strength of 50 % of sulphuric ,acid, (H2SO4), potassium ... The ferroin indicator is an important element in the ,determination, of ,wastewater cod, as the change in color to reddish-brown from bluish green indicates the ... (Hg2Cl2). The formation of this mercurous chloride prevents the ,interference, of other substances in ...

Nitrite interference and elimination in diphenylcarbazide ...
Nitrite interference and elimination in diphenylcarbazide ...

Sulfamic acid had been used to enhance the efficiency of high-concentration nitrite-containing wastewater by microwave treatment process (Li et al. 2010), and remove nitrite for accurate determination of nitrate or chemical oxygen demand (COD) (Marouf-Khelifa et al. 2006).

A method for removing persulfate interference in the ...
A method for removing persulfate interference in the ...

In recent years, sulfate radical-based advanced oxidation has received increasing attention for the treatment of water and ,wastewater,. However, the ,chemical oxygen demand, (,COD,), a common measure of gross organic contamination, is subject to ,interference, from residual persulfate in the treated water. In this study, a new method, based on addition of sodium sulfite (Na2SO3) and heating, has …

DETERMINATION OF CHEMICAL OXYGEN DEMAND COD
DETERMINATION OF CHEMICAL OXYGEN DEMAND COD

Chemical oxygen demand, does not differentiate between biologically available and inert organic matter, and it is a measure of the total quantity of oxygen required to oxidize all organic material into carbon dioxide and water. ,COD, values are always greater than BOD values. For domestic and some industrial ,wastewater COD, is about 2.5 times BOD.

Determination of the chemical oxygen demand (COD) in water ...
Determination of the chemical oxygen demand (COD) in water ...

COD, is widely used in the analysis of natural water, to control ,wastewater, treatment from organic various substances. Lumex Instruments provides the method and equipment (FLUORAT-02 analyzer and TERMION thermoreactor) for accurate, easy-to-use and cost-effective ,COD determination, using the small-scale sealed tube method (ST-,COD,).

Wastewater COD - How to Use Chemical Reactions to ...
Wastewater COD - How to Use Chemical Reactions to ...

In a solution with a strength of 50 % of sulphuric ,acid, (H2SO4), potassium ... The ferroin indicator is an important element in the ,determination, of ,wastewater cod, as the change in color to reddish-brown from bluish green indicates the ... (Hg2Cl2). The formation of this mercurous chloride prevents the ,interference, of other substances in ...

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