The owner of the wholesale store saw Duan Zetao's surprised expression, and introduced with some pride: "If you buy my oil, you can definitely rest assured, even if the health and epidemic prevention department goes to your hotel to inspect it, it will definitely not find a ......problem."

Saying that, the owner of the wholesale store walked to the corner, picked up a small sealed bottle of branded cooking oil, opened a barrel of bulk cooking oil, poured some into a transparent plastic cup, and put it together with the sealed brand cooking oil, and said a little pretentiously: "Look at the color of this oil, it is very transparent, you can't tell the difference between these two oils with the naked eye......

As he spoke, he picked up the transparent plastic cup and handed it to Duan Zetao, "You can still smell it, and I guarantee that there is no peculiar smell!" The people who come to me to buy oil are all big customers, there are big hotels, there are school canteens, and each time they ask for a large amount of goods, dozens of barrels at a time......," the owner of the wholesale store gushed about selling his oil.

Duan Zetao and the others were even more surprised, the cup of oil in front of them was too different from the gutter oil in their impression, which also showed that these black-hearted businessmen who made gutter oil were also "advancing with the times", and this kind of "refined gutter oil", which was completely indistinguishable from qualified edible oil, was more hidden, and it could actually flow into big hotels and school canteens in a grand manner, which was even more harmful.

In the end, Duan Zetao and they bought ten barrels of such "refined gutter oil" to go back, this time Duan Zetao and they also brought some simple testing instruments and a staff who knew how to test, and after they went back, they immediately extracted ten samples of these ten barrels of oil and tested them with testing instruments.

The test results surprised everyone again, because the test results of these 10 sample oils fully met the general index requirements of edible vegetable oil and edible animal oil!

"How so?! Could it be that what we bought this time was not 'gutter oil'?! Duan Zetao said very seriously to the staff member in charge of testing.

The staff in charge of testing also said a little dazedly: "Gutter oil testing has always been a difficult problem for us, just now I tested the polycyclic aromatic hydrocarbons, cholesterol, conductivity, specific gene composition and acid value and other harmful substance indicators of these ten sample oils according to the conventional edible oil testing standards, and found no abnormal ......."

"But this does not rule out that these oils are not gutter oil, but also need to detect several harmful substances such as aflatoxin B1, trans fatty acids and benzopyrene, which is also the main harmful components in gutter oil, we brought the testing equipment this time can not detect these indicators, if you must test, you can only send it back to the testing center of the General Administration, only there is a special testing equipment to detect these harmful substance indicators ......."

Duan Zetao frowned and asked: "Since harmful substances such as aflatoxin B1, trans fatty acids and benzopyrene are harmful to human health, why don't our edible oil testing standards include these indicators in the routine testing indicators?!" ……”。

The staff in charge of testing hesitated for a moment and said: "Now the preparation of edible vegetable oil in China generally adopts two methods: physical pressing method and chemical leaching method, physical pressing method because of the low oil yield, so now many regular edible oil manufacturers will choose chemical leaching method, however, the whole process of chemical leaching oil process will use chemical reagents, and some refining processes even use sulfuric acid, so some chemicals will remain in chemical leaching edible oil, including aflatoxin B1, Trans fatty acids and benzopyrene and other harmful substances, and these substances are also the main harmful substances in gutter oil, so it adds a lot of difficulty to distinguish between gutter oil and qualified edible oil......".

Duan Zetao nodded, and said with a solemn face: "It seems that there are still big omissions in our edible oil testing standards, and after we go back, we must organize the technical department to tackle key problems, and strive to find a simple and fast way to distinguish between gutter oil and qualified edible oil as soon as possible!" ……”。

At this time, Ma Nanshan and Hu Tielong walked in from outside, the two of them were more like collecting swill than when they went, and there was a sour smell all over their bodies, everyone laughed when they saw it, Zhu Wanjun pinched his nose and said: "Ma Ju, Brother Tielong, go take a bath, otherwise we will all be smoked to death by you!" ……”。

Duan Zetao also smiled slightly: "Nanshan, Tielong, you have worked hard, go take a shower first, change your clothes, and then we will discuss it and see what you have gained over there, it just so happens that we also have some new discover......ies here."

Ma Nanshan and Hu Tielong took a bath for nearly half an hour, and when they came out after changing their clothes, they still had a faint strange smell on their bodies, which showed what harsh conditions they had been living and working under these days, so as soon as they came out, everyone looked at them with admiration.

Duan Zetao patted Ma Nanshan's shoulder vigorously and said with a smile: "Comrade Nanshan, it's good!" After returning to the bureau, I want to call on everyone to learn from you and Tielong's spirit of not being afraid of danger, hardship, and dirty for work! Come on, tell me, what's your take?! ……”。

Ma Nanshan said about their experience in the past few days, "They may have learned the news that we came down to investigate, and they are going to stop production for a while, so it doesn't make much sense for me and Tielong to stay there any longer, now it seems that this big boss behind the scenes is not only powerful, well-organized, and vigilant, but also has vast powers and is well-informed, and is very cautious and cunning!" It seems that it is really not easy to catch this big fish! Now the only important clue I get here is the license plate number, and I hope to find the specific information of the big boss behind the scenes! ……”。

Duan Zetao laughed and said, "No matter how cunning the opponent is, he will always show his fox tail!" Nanshan, you have already caught the fox's tail now, and I believe that it will not be long before this fox will completely surface and have nothing to hide! ……”。

Ma Nanshan nodded heavily, and then he also noticed the ten barrels of oil in the room, so he asked strangely, "Where did this oil come from?" ……”。

Duan Zetao also told them about their experience in the wholesale market, and Ma Nanshan was also taken aback when he learned that these 'refined gutter oil' were actually bought from the wholesale market, as well as the QS certification mark, and walked over to take a closer look at the ten samples of 'refined gutter oil' extracted, and suddenly patted his head and said: "I have a way to tell if this is gutter oil!" ……”。