xov xwm

I. Qhov "Grey Zone" ntawm Organic Standards

Qhib "Cov Cai rau Kev Siv Cov Khoom Siv Organic Certification," Tshooj 7 ntawm Tshooj 2 qhia meej txog 59 hom tshuaj tua kab ntawm cov nroj tsuag thiab cov ntxhia hauv keeb kwm uas tau tso cai siv. Biopesticides xws li azadirachtin thiab pyrethrins yog suav nrog. Txawm hais tias cov tshuaj no tau muab rho tawm los ntawm cov nroj tsuag ntuj tau txhais tias yog "tsis muaj tshuaj lom," cov tshuaj tsuag ntau dhau kuj tseem ua rau cov khoom seem. Ntawm qhov kev txhawj xeeb ntau dua yog tias cov qauv ntawv pov thawj tau teeb tsa lub sijhawm ua kom huv hauv av ntawm 36 lub hlis, tab sis glyphosate metabolites los ntawm kev ua liaj ua teb dhau los tseem tuaj yeem kuaj pom hauv cov dej hauv av ntawm qee lub hauv paus hauv North China Plain.

Case ntawmtshuaj chlorpyrifosresidue nyob rau hauv cov ntaub ntawv ntsuam xyuas yog ceeb toom. Ib lub hauv paus muaj ntawv pov thawj, nyob ib sab ntawm cov teb chaws ib txwm muaj, raug kev txom nyem los ntawm cov tshuaj tua kab uas muaj kuab paug thaum lub caij ntuj nag, ua rau pom 0.02 mg / kg ntawm organophosphorus residue hauv cov qauv spinach. Qhov no "passive pollution" nthuav tawm qhov tsis txaus ntawm cov ntawv pov thawj uas twb muaj lawm nyob rau hauv kev saib xyuas kev ua liaj ua teb ib puag ncig, rhuav tshem cov purity ntawm kev ua liaj ua teb organic.

II. Qhov Tseeb Unveiled hauv Laboratories

Thaum siv cov pa roj chromatography-mass spectrometry, cov kws tshaj lij tau teeb tsa qhov kev kuaj pom ntawm qhov ntsuas ntawm 0.001 mg / kg. Cov ntaub ntawv qhia tau hais tias 90% ntawm cov qauv zoo muaj cov seem seem tsuas yog 1/50 txog 1/100 ntawm cov zaub hauv cov zaub, sib npaug rau xa ob tee ntawm tus number case rau hauv lub pas dej da dej. Txawm li cas los xij, kev nce qib hauv kev tshawb pom niaj hnub siv thev naus laus zis tau ua rau kev ntes cov molecules ntawm qib ib-hauv-ib-nplooj, ua rau "zero residue" tsis ua haujlwm.

Lub complexity ntawm cross-contamination chains yog dhau qhov kev xav. Warehouse contamination vim lub tsheb thauj mus los tsis tiav suav nrog 42% ntawm qhov xwm txheej, thaum sib cuag cov kab mob tshwm sim los ntawm kev sib xyaw ntawm qhov chaw ntawm lub khw muag khoom txee rau 31%. Ntau insidiously, cov tshuaj tua kab mob sib xyaw rau hauv qee cov organic chiv raw cov ntaub ntawv nws thiaj li nkag mus rau cov zaub cell los ntawm bioaccumulation.

III. Ib txoj hauv kev zoo los txhim kho kev ntseeg siab

Tawm tsam daim ntawv tshaj tawm kev sim, tus neeg ua liaj ua teb organic tau nthuav tawm lawv "pob tshab traceability system": QR code ntawm txhua pob tso cai rau kev nug txog qhov piv ntawm Bordeaux sib tov thiab cov ntaub ntawv soj ntsuam av rau thaj tsam peb mais. Txoj hauv kev no ntawm kev tso cov txheej txheem ntau lawm hauv qhov qhib yog rov tsim kho cov neeg siv khoom ntseeg siab.

Cov kws paub txog kev nyab xeeb khoom noj pom zoo kom siv "triple purification method": soaking hauv baking soda dej kom decompose fat-soluble tshuaj tua kab, siv ultrasonic nqus tsev vacuum tshem tawm deg adsorbates, thiab blanching rau 5 vib nas this ntawm 100 ° C kom inactivate biological enzymes. Cov txheej txheem no tuaj yeem tshem tawm 97.6% ntawm qhov seem seem, ua rau txoj kab kev tiv thaiv kev noj qab haus huv muaj zog dua.

Cov ntaub ntawv ntsuam xyuas yuav tsum tsis txhob ua qhov kev txiav txim siab tsis lees paub tus nqi ntawm kev ua liaj ua teb organic. Thaum peb sib piv 0.008 mg / kg ntawm chlorpyrifos residue nrog 1.2 mg / kg kuaj pom nyob rau hauv cov pa celery, peb tseem tuaj yeem pom cov txiaj ntsig tseem ceeb ntawm cov txheej txheem tsim cov organic hauv kev txo cov tshuaj tua kab. Tej zaum qhov tseeb purity tsis dag nyob rau hauv kiag li xoom, tab sis nyob rau hauv tsis tu ncua mus zero, uas yuav tsum tau producers, regulators, thiab cov neeg tau txais kev pab koom tes weave ib tug nruj nreem network.