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UV Identification of Baoxin Tablets, Paper Chromatography Identification of Huazheng Huisheng Tablets and TLC Identification of Niuhuang Jiedu Pills

 Time of Update: 2022-06-15

the filtrate to dryness, add 5ml of 1% hydrochloric acid solution to the residue to dissolve, filter, and add sodium
Inspection of Methanol Amount of Guogong Liquor (Gas Chromatography)

 Time of Update: 2022-06-15

>>Determination method: Precisely measure 1ml of the internal standard solution, put it in a 10ml measuring flask, add the test solution to the mark, shake it up, and use it as the test solution
Introduction to the application of gas generators in gas chromatography

 Time of Update: 2022-05-03

of the gas . 　　Secondly, whether the nitrogen generator can be well used in gas chromatography analysis experiments has a lot to do with the principle of the generator
Rapid determination of trans fatty acids in instant drinks (gas chromatography)

 Time of Update: 2022-03-17

The detection methods of trans fatty acids mainly include infrared spectroscopy (IR), anion thin layer chromatography (Ag-TLC), gas chromatography (GC), etc.
Determination of Alkyl Mercury in Solid Waste Leachate Purge and Trap/Gas Chromatography-Cold Atomic Fluorescence Method (2)

 Time of Update: 2022-03-12

0 pg/L, 100 pg/L) that meet the detection limit of the instrument, linear range and actual sample mass concentration, and quantify by external standard method .
Determination of Alkyl Mercury in Solid Waste Leachate Purge and Trap/Gas Chromatography-Cold Atomic Fluorescence Method (1)

 Time of Update: 2022-03-12

Five, pre-treatment(1) Preparation of leaching solution"Semi-Volatile Organic Compound Analysis Technology-Preparation of Sulfuric Acid and Nitric Acid from Leachate"(2) Steaming letterAccurately measure 45mL pure water (or sample, need to add 0.
Solid waste leachate-determination of organochlorine pesticides-gas chromatography (1)

 Time of Update: 2022-03-12

Acid and Nitric Acid from Leachate">(2) Extraction>Take 100 mL of the extract in a separatory funnel, add 5 g of sodium chloride, shake, shake, and then add 20 mL of dichloromethane
Solid Waste-Determination of Dioxins-Isotope Dilution High Resolution-Gas Chromatography-High Resolution Mass Spectrometry (1)

 Time of Update: 2022-03-10

Then use 16 mL of dichloromethane-n-hexane solvent with a volume ratio of 6:4 to clean the alumina column several times, collect the eluent into a sample bottle, and blow the eluent to nearly dry with nitrogen .
Solid waste leachate—Determination of Toxaphene—Gas Chromatography (1)

 Time of Update: 2022-03-10

waste leachate>"Semi-Volatile Organic Compound Analysis Technology-Preparation of Sulfuric Acid and Nitric Acid from Leachate">(2) Extraction>Take
Solid waste leachate-determination of polychlorinated biphenyls-gas chromatography (1)

 Time of Update: 2022-03-10

Second, the principle of the methodUse dichloromethane to extract PCBs in the leachate, purify with concentrated sulfuric acid , and analyze PCBs in the sample by gas chromatography electron capture detector method (GC-ECD).
Solid Waste—Determination of Organophosphorus Pesticides—Gas Chromatography (2)

 Time of Update: 2022-03-10

)>Injection port temperature: 230℃; sampling mode: split injection, split ratio: 10:1; constant pressure mode: flow rate 1. 0mL/min . >>
Solid waste leachate—Determination of Toxaphene—Gas Chromatography (2)

 Time of Update: 2022-03-10

>. >>Carrier gas: nitrogen, purity ≥99. 999%; constant pressure mode: flow rate of 1. 0mL/min; detector temperature: 300℃ . >
Solid waste leachate—Determination of Chlordane—Gas Chromatography (1)

 Time of Update: 2022-03-10

>>(1) Preparation of solid waste leachate>"Semi-Volatile Organic Compound Analysis Technology-Preparation of Sulfuric Acid and Nitric Acid from Leachate">(2
Solid waste leachate-determination of polychlorinated biphenyls-gas chromatography (2)

 Time of Update: 2022-03-10

0ug/L, 100ug/L, 200ug/L, 500ug/L) that meets the instrument's detection limit, linear range and actual sample mass concentration, add Add a substitute for the same product (such as 100ug/L), dilute with n-hexane , and quantify by internal standard method .
Solid waste leachate-determination of organochlorine pesticides-gas chromatography (2)

 Time of Update: 2022-03-10

Six, analysis and testing(1) Reference conditions of gas chromatography (for reference only, can be adjusted appropriately according to the actual instrument)Inlet temperature: 250%:, sampling method: split injection, split ratio is 10:1, constant pressure control, injection volume is 1uL .
Solid Waste—Determination of Organophosphorus Pesticides—Gas Chromatography (1)

 Time of Update: 2022-03-10

>>"Semi-Volatile Organic Compound Analysis Technology-Preparation of Sulfuric Acid and Nitric Acid from Leachate">2. Picking>Take 100 mL
Determination of 13 semi-volatile organic compounds in solid waste leachate-gas chromatography-mass spectrometry (1)

 Time of Update: 2022-03-10

>(1) Preparation of solid waste leachate (refer to HJ/T299)>"Semi-Volatile Organic Compound Analysis Technology-Preparation of Sulfuric Acid and Nitric Acid from Leachate">
Determination of 13 semi-volatile organic compounds in solid waste leachate-gas chromatography-mass spectrometry (2)

 Time of Update: 2022-03-10

Use the average relative response factor to establish a calibration curveThe relative response factor RRF i of the target in the ith point of the standard series is calculated according to formula (1) .
Solid waste leachate—Determination of chlordane—gas chromatography (2)

 Time of Update: 2022-03-10

: nitrogen, purity ≥99. 999%, constant pressure mode: flow rate is 1. 0mL/min; detector temperature: 300℃ . >The chromatographic column connected to the forward inlet
Solid Waste-Determination of Dioxins-Isotope Dilution High Resolution-Gas Chromatography-High Resolution Mass Spectrometry (3)

 Time of Update: 2022-03-09

/>>Related Links: Solid Waste-Determination of Dioxins-Isotope Dilution High Resolution-Gas Chromatography-High Resolution Mass Spectrometry (2)> > >>

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