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New national standard food sulfur dioxide ("Chinese Pharmacopoeia" method to detect sulfur dioxide in traditional Chinese medicine) supporting special equipment: ST109A, ST109B, ST109C, ST109D are all standard equipped with automatic reagent addition and automatic nitrogen blowing control function (the first in the country)! ! !
R&D background:
With the promulgation of the new national standard GB5009.34-2022 "Determination of Sulfur Dioxide in Food", the determination and detection methods of sulfur dioxide in food and Chinese herbal medicines in "Chinese Pharmacopoeia" are roughly the same. According to the new national standard and pharmacopoeia methods, Jinan Shengtai Technology has developed four special testing instruments : ST109A, ST109B, ST109C and ST109D .
Features:
* Heating method: automatic far-infrared ceramic heating management system, automatic anti-dry burning technology;
* Cooling method: The integrated design of the built-in compressor in the main engine automatically completes the internal circulation of cooling water, without the need for an external chiller;
* Condenser design: national standard special reflux condenser;
* Control system: automatic heating technology, micro-boiling and full-boiling heating modes can be set; automatic timing 0-999min;
* Reagent addition: Reagent addition can be completed automatically through a high-precision reagent filling pump without manual operation;
* Nitrogen control: rotameter control, range: 200-2000ml/min;
Comparison of the new and old national standard detection methods for the determination of food sulfur dioxide (the first method) GB5009.34-2016? GB5009.34-2022 (new national standard) Detection method titration The titration method was changed to: acid-base titration, adding the second method of spectrophotometry and the third method of ion chromatography. scope of test This standard specifies the method for the determination of total sulfur dioxide in foods such as preserved fruits, dried vegetables, rice noodles, vermicelli, sugar, edible fungi and wine. The first method is the acid-base titration method, which is suitable for the determination of sulfur dioxide in food;
The second method is the spectrophotometric method. The direct extraction method is suitable for the determination of sulfur dioxide in sugar and white sugar products, starch and starch products, raw wet flour products, etc. without oil and the extraction liquid has no color interference. The nitrogen-filled distillation extraction method is suitable for the determination of sulfur dioxide. Determination of sulfur dioxide in colored samples such as wine and brown sugar;
The third method is ion chromatography, which is suitable for the determination of sulfur dioxide in food.Sample preparation 5g homogeneous sample (accurate to 0.001g, the sampling amount depends on the content), liquid sample can directly absorb 5.00mL ~ 10.00mL sample; add 250ml of water; add 10ml of hydrochloric acid. Take a solid or semi-fluid sample of 20 g ~ 100 g (accurate to 0.01 g, the sampling amount depends on the content); take a liquid sample of 20 mL (g) ~ 200 mL (g); add 20-500 ml of water; Add 10 ml of 6 mol/L hydrochloric acid. Whether nitrogen-filled distillation no Nitrogen-filled distillation, flow rate: 1.0-2.0L/min Absorbent 25mL lead acetate absorption solution 3% hydrogen peroxide solution 50mL (the first method) Distillation method 200 ml of distillate was collected, distilled for another 1 minute, and the device inserted into the absorption solution was rinsed with a small amount of distilled water. The solution in the flask was heated to boiling and kept slightly boiling for 1.5h. Titration method Add 10 mL of hydrochloric acid and 1 mL of starch indicator solution to the removed iodine flask in turn, shake well and titrate with iodine standard solution until the color of the solution turns blue and does not fade within 30s. At the same time do a blank test. Allow the absorption solution to cool and shake well, add 3 drops of 2.5 mg/mL methyl red ethanol solution indicator to the absorption solution, titrate with sodium hydroxide standard solution (0.01 mol/L) until it becomes yellow and does not fade for 20 seconds, and At the same time, a blank test was carried out. detection limit and quantification limit When a 5g solid sample was taken, the limit of detection (LOD) of the method was 3.0mg/kg, and the limit of quantification was 10.0mg/kg; when a 10mL liquid sample was taken, the limit of detection (LOD) of the method was 1.5mg/L, The limit of quantification was 5.0 mg/L. When using 0.01mol/L sodium hydroxide titration solution, when the solid or semi-fluid sample volume is 35g, the detection limit is 1mg/kg, and the quantification limit is 10mg/kg; when the liquid sampling volume is 50mL (g), the detection limit is The output limit was 1 mg/L (mg/kg), and the quantification limit was 6 mg/L (mg/kg). Product recommended model ST106-1RW (distillation pretreatment), ST106K2 (automatic, can directly output test results.) All ST109 series (A is a six-digit, fully automatic model, and the test results are directly output; B is a six-digit; C is an eight-digit, cost-effective model; D is a special machine for ion chromatography steam distillation), the whole system comes standard with automatic addition Acid and nitrogen control device (A adopts digital imported nitrogen controller, other models are rotameter). The whole series is compatible with the detection of sulfur dioxide in traditional Chinese medicine and Chinese herbal medicines. Jinan Shengtai Technology ST109 series intelligent sulfur dioxide analyzer product parameter comparison table model ST109A ST109B ST109C ST109D According to the standard GB5009.34-2022 "Determination of sulfur dioxide in food", 2015 edition, 2020 edition of "Chinese Pharmacopoeia" for the determination of sulfur dioxide in traditional Chinese medicines and Chinese medicinal materials; Corresponding standard GB5009.34-2022 The first method, the second method GB5009.34-2022 The first method, the second method GB5009.34-2022 The first method, the second method The third law of GB5009.34-2022 Product Positioning High-end, fully automatic Standard version Cost-effective Special machine for steam distillation Number of samples 6 6 8 6 flask volume Conventional double mouth 1000ml flask Double neck 1000ml custom flask Conventional double mouth 1000ml flask Conventional double mouth 500ml flask heating method Far infrared ceramic heating Far infrared ceramic heating Far infrared ceramic heating Built-in steam source steam heating Condenser tube structure Reflow type, semi-hidden structure Reflux condenser Reflow type, semi-hidden structure serpentine condenser Automatic acid addition Automatic acid addition Automatic acid addition Automatic acid addition Automatic acid addition Nitrogen control Digital Adjustable Nitrogen Equal Distribution System Rotameter (200-2000ml/min) Rotameter (200-2000ml/min) Rotameter (200-2000ml/min) cooling method External cooling water circulation machine Built-in compressor self-circulating cooling system External cooling water circulation machine External cooling water circulation machine Control method Desktop PC LCD touch screen LCD touch screen LCD touch screen automatic titration Automatic titration with high precision syringe pump none none —— Endpoint identification High-precision visual sensor, completely simulating the human eye, automatically identifying the end point of titration none none none rated power 3500W 3600W 4500W 3000W Dimensions (mm) 735×650×670 960×575×410 940×650×680 960×500×730
keywords: the new laboratory analytical instruments, intelligent pre-processing equipment