Loi b Asen, Amoni khi nc n th no?

Loi b Asen, Amoni khi nc n th no? Xut bn Vit Php (https://www.viphatech.com)

Loi b Asen, Amoni khi nc n th no? viphatech gi vo T3, 12/06/2012 - 1:35sa

Sau khi Bo G&XH c bi phn nh vtnh trng ngun nc nhiu khu vc trn a bn H Ni b nhim Asen (thch tn) v Amoni, nhiuc gi gi in n ng dy nng ngh Bo cung cp bin php pht hin v x l ngunnc nhim c ny. Pht hin c t Trao i vi PV Bo G&XH, GS.TS Trn Hng Cn, Khoa Ho, Trng H Khoa hc T nhin(HQGHN) khng nh: Khng th pht hin c c cht Amoni hay Asen c trong ngun ncbng mt thng, v Asen l mt nguyn t ho hc khng mu, khng mi. Theo TS Cn, ngi dn c th pht hin ngun nc hin ang s dng c b nhim c cht Asenhay khng bng cch th test nhanh vi mt dng c th c tn gi l test Asen hoc Arsen check,hin ang c bn ti mt s cng ty ho cht, hoc Phng phn tch a cht (Vin Ho hc) vCng ty TNHH Cng ngh HCTH c tr s ti huyn M Ho, Hng Yn vi gi khong 25.000/ snphm test Asen hoc 38.000/Arsen check. Sau khi nh dung dch t 7-10 pht, nu cc nc thchuyn mu vng c th ngun nc b nhim c.

Theo quy nh ca B Y t, nng Asen trong nc khng c vt qu 0,01mg/l lt nc n. Tuynhin, nu mun bit nng nhim Asen trong ngun nc sau khi th test nhanh l bao nhiu, thngi dn cn phi n Phng phn tch ca Vin a cht (Vin Khoa hc Cng ngh) th. Donng Asen nhim trong ngun nc thay i theo ma, nn phi kim tra nc theo nh k t 4- 6 thng 1 ln.

Cng theo GS.TS Trn Hng Cn, s dng nc nhim Asen trong mt thi gian di c th gy ngc hoc ung th gan, phi, da hoc khuyt tt bm sinh. Ti liu ca Cc Y t D phng (B Y t)cng cho thy, ngi ung nc nhim Asen qu mc cho php d mc cc bnh ung th, tiu chy,thu u v nht l ung th da. Nu dng ngun nc nhim Asen nng 0,1mg/lt, s dn nh tun hon b u c.

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Loi b Asen, Amoni khi nc n th no? Xut bn Vit Php (https://www.viphatech.com)

Ng c Asen c hai dng: Ng c cp tnh v ng c mn tnh. Du hiu ca ng c cp tnhthng c triu chng ging nh bnh t: Nn ma, au bng, tiu chy lin tc, kht nc d di,mch p yu, mt nht nht ri thm tm, b tiu v c th t vong; Ng c mn tnh xy ra dotch lu liu lng nh Asen trong thi gian di. Asen thm nhp vo c th ch yu qua thc phm,nc ung v khng kh. Vic pht hin ngi nhim Asen mn tnh rt kh do triu chng ca bnhphi t 5- 15 nm sau mi xut hin.

V tc hi ca ngun nc nhim Amoni, TS L Vn Ct (Vin Khoa hc v Cng ngh Vit Nam) chorng, bn thn cht Amoni khng gy hi trc tip cho c th ngi m ch nh hng xu i vi ssng ca cc loi vt di nc nh: Tm, c... Tuy nhin, trong qu trnh khai thc, x l v lu trnc, Amoni chuyn ho thnh nitrit v nitrat. Nitrit l cht rt c hi cho c th, c th gy ungth.

Nhng bin php loi b Asen, Amoni khi nc n

Theo GS.TS Trn Hng Cn, cch y nhiu nm, ng v cc cng s ti Khoa Ho, Trng H Khoahc T nhin nghin cu v p dng thnh cng thit b x l Asen trong nc sinh hot bng tst, ong, son.

Sn phm loi b Asen trong nc theo cng ngh ca GS.TS Trn Hng Cn.

Thit b ny c cu to nh chic bnh lc nc thng thng, gm: Mt chic thng c 2 ngnbng inox. Ngn th nht (u vo) cha mt ct lc. Khi nc chy qua ct lc, Asen trong nc bxy ho, cc ht t st, ong v son s bin tnh trong gi li Asen. Ngi dn c thyn tm s dng nc sch thng th hai. Mi nm, thay ct lc mt ln.

Theo GS.TS Cn, thit b ny c th nghim lc ging khoan ti khu vc tp th 51 Cm Hi(phng ng Mc, Hai B Trng, H Ni) trong 10 ngy lin tc v cho kt qu: Trc khi nc lc,nng Asen trong nc giao ng t 0,186-0,189mg/1 lt nc vo ma kh. Sau khi a vo bnhlc, t l Asen trong nc cn nh hn 0,01mg/lt, di gii hn ca B Y t v tiu chun ca Asen

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Loi b Asen, Amoni khi nc n th no? Xut bn Vit Php (https://www.viphatech.com)

trong nc n.

Cui nm 2008, cng ngh loi b cht Asen trong nc sinh hot ca GS.TS Trn Hng Cn v cngs c mt cng ty chuyn v x l nc cng ngh cao ca Th S mua ton b cng nghvo a vo sn xut thit b lc nc s dng trong gia nh vi tn gi l Arsen FREE c gi bnkhong 1.600.000/bnh.

Ngoi phng php loi b Asen bng t st, ong v son nh trn mt bin php khc c thp dng d dng ti nng thn l s dng b lc c gin ma v ct vng dy khong 40- 60cm.Bin php ny ang c mt s h dn tnh H Nam lp t th im di s h tr ca Unicef,kt qu cho thy loi b c 94-99% t l Asen c trong nc.

Bc s Nguyn Thnh, Trng khoa Khm bnh, Vin Da liu Quc gia cho bit, Asen ngm vo cth qua ng ung mt cch t t, khng rm r ngi bnh thy khc thng m i khmngay. Tuy nhin, c th nhn bit sm loi nhim c ny thng qua cc biu hin ngoi da nh: Rilon sc t (c nhng chm nht hoc m hn mu da), dy sng nhng vng da t tip xc nhgia lng bn tay, lng bn chn.

Cng ngh mi trng

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