what is calcium disodium edta

{"cid":"91196289","title":"Glucose Plasma Blood Collecting Tube Calcium Disodium EDTA In Clinic Lab Test","imgUrl":"https:\/\/img.ismap.com\/nimg\/3f\/d8\/1067ffb7060a1a31cce36032092a-200x200-1.jpg","attrs":{"Price":"usd0.25-0.45pcs","Brand Name":"CIPING","Model Number":"CP-FE","Minimum Order Quantity":"10000pcs","Delivery Time":"10-15days","Certification":"CE,ISO13485","Place of Origin":"China","Payment Terms":"L\/C, T\/T, Western Union, MoneyGram, Paypal","Supply Ability":"1200000 Piece\/Pieces per Day","Packaging Details":"100pcs\/rack,1800pcs\/ctn or 100pcs\/rack,1200pcs\/ctn","material":"pp\/pet\/glass","color":"white, blue , grey, green,white, red","Application":"BLOOD COLLECTION","VOLUME":"1ML-6ML","Size":"13X75,13X100,16X100","additives":"sodium citrate"}}